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IP [n]" accesskey="n"><span>Discusión</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Sitio"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Contenidos" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Contenidos</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">mover a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">ocultar</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Inicio</div> </a> </li> <li id="toc-Matemáticas" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Matemáticas"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Matemáticas</span> </div> </a> <ul id="toc-Matemáticas-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Otras_ciencias" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Otras_ciencias"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Otras ciencias</span> </div> </a> <ul id="toc-Otras_ciencias-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Véase_también" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Véase_también"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Véase también</span> </div> </a> <ul id="toc-Véase_también-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Referencias" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Referencias"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Referencias</span> </div> </a> <ul id="toc-Referencias-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contenidos" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Cambiar a la tabla de contenidos" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Cambiar a la tabla de contenidos</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Veintiuno</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Ir a un artículo en otro idioma. Disponible en 97 idiomas" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-97" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">97 idiomas</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ab mw-list-item"><a href="https://ab.wikipedia.org/wiki/21_(%D0%B0%D1%85%D1%8B%D4%A5%D1%85%D1%8C%D0%B0%D3%A1%D0%B0%D1%80%D0%B0)" title="21 (ахыԥхьаӡара) (abjasio)" lang="ab" hreflang="ab" data-title="21 (ахыԥхьаӡара)" data-language-autonym="Аԥсшәа" data-language-local-name="abjasio" class="interlanguage-link-target"><span>Аԥсшәа</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/21_(%D8%B9%D8%AF%D8%AF)" title="21 (عدد) (árabe)" lang="ar" hreflang="ar" data-title="21 (عدد)" data-language-autonym="العربية" data-language-local-name="árabe" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ary mw-list-item"><a href="https://ary.wikipedia.org/wiki/21" title="21 (Moroccan Arabic)" lang="ary" hreflang="ary" data-title="21" data-language-autonym="الدارجة" data-language-local-name="Moroccan Arabic" class="interlanguage-link-target"><span>الدارجة</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/21_(%C9%99d%C9%99d)" title="21 (ədəd) (azerbaiyano)" lang="az" hreflang="az" data-title="21 (ədəd)" data-language-autonym="Azərbaycanca" data-language-local-name="azerbaiyano" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%DB%B2%DB%B1_(%D8%B3%D8%A7%DB%8C%DB%8C)" title="۲۱ (سایی) (South Azerbaijani)" lang="azb" hreflang="azb" data-title="۲۱ (سایی)" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-ban mw-list-item"><a href="https://ban.wikipedia.org/wiki/21_(angka)" title="21 (angka) (balinés)" lang="ban" hreflang="ban" data-title="21 (angka)" data-language-autonym="Basa Bali" data-language-local-name="balinés" class="interlanguage-link-target"><span>Basa Bali</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/21_(%D1%87%D0%B8%D1%81%D0%BB%D0%BE)" title="21 (число) (búlgaro)" lang="bg" hreflang="bg" data-title="21 (число)" data-language-autonym="Български" data-language-local-name="búlgaro" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bo mw-list-item"><a href="https://bo.wikipedia.org/wiki/%E0%BC%A2%E0%BC%A1_(%E0%BD%82%E0%BE%B2%E0%BD%84%E0%BD%A6%E0%BC%8B%E0%BD%80%E0%BC%8D)" title="༢༡ (གྲངས་ཀ།) (tibetano)" lang="bo" hreflang="bo" data-title="༢༡ (གྲངས་ཀ།)" data-language-autonym="བོད་ཡིག" data-language-local-name="tibetano" class="interlanguage-link-target"><span>བོད་ཡིག</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Vint-i-u" title="Vint-i-u (catalán)" lang="ca" hreflang="ca" data-title="Vint-i-u" data-language-autonym="Català" data-language-local-name="catalán" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cdo mw-list-item"><a href="https://cdo.wikipedia.org/wiki/21" title="21 (Mindong)" lang="cdo" hreflang="cdo" data-title="21" data-language-autonym="閩東語 / Mìng-dĕ̤ng-ngṳ̄" data-language-local-name="Mindong" class="interlanguage-link-target"><span>閩東語 / Mìng-dĕ̤ng-ngṳ̄</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D9%A2%D9%A1_(%DA%98%D9%85%D8%A7%D8%B1%DB%95)" title="٢١ (ژمارە) (kurdo sorani)" lang="ckb" hreflang="ckb" data-title="٢١ (ژمارە)" data-language-autonym="کوردی" data-language-local-name="kurdo sorani" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/21_(%C4%8D%C3%ADslo)" title="21 (číslo) (checo)" lang="cs" hreflang="cs" data-title="21 (číslo)" data-language-autonym="Čeština" data-language-local-name="checo" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/21_(%D1%85%D0%B8%D1%81%D0%B5%D0%BF)" title="21 (хисеп) (chuvasio)" lang="cv" hreflang="cv" data-title="21 (хисеп)" data-language-autonym="Чӑвашла" data-language-local-name="chuvasio" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/21_(rhif)" title="21 (rhif) (galés)" lang="cy" hreflang="cy" data-title="21 (rhif)" data-language-autonym="Cymraeg" data-language-local-name="galés" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/21_(tal)" title="21 (tal) (danés)" lang="da" hreflang="da" data-title="21 (tal)" data-language-autonym="Dansk" data-language-local-name="danés" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Einundzwanzig" title="Einundzwanzig (alemán)" lang="de" hreflang="de" data-title="Einundzwanzig" data-language-autonym="Deutsch" data-language-local-name="alemán" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/21_(%CE%B1%CF%81%CE%B9%CE%B8%CE%BC%CF%8C%CF%82)" title="21 (αριθμός) (griego)" lang="el" hreflang="el" data-title="21 (αριθμός)" data-language-autonym="Ελληνικά" data-language-local-name="griego" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-eml mw-list-item"><a href="https://eml.wikipedia.org/wiki/21_(n%C3%B9mer)" title="21 (nùmer) (Emiliano-Romagnolo)" lang="egl" hreflang="egl" data-title="21 (nùmer)" data-language-autonym="Emiliàn e rumagnòl" data-language-local-name="Emiliano-Romagnolo" class="interlanguage-link-target"><span>Emiliàn e rumagnòl</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/21_(number)" title="21 (number) (inglés)" lang="en" hreflang="en" data-title="21 (number)" data-language-autonym="English" data-language-local-name="inglés" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/21_(nombro)" title="21 (nombro) (esperanto)" lang="eo" hreflang="eo" data-title="21 (nombro)" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Hogeita_bat" title="Hogeita bat (euskera)" lang="eu" hreflang="eu" data-title="Hogeita bat" data-language-autonym="Euskara" data-language-local-name="euskera" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%DB%B2%DB%B1_(%D8%B9%D8%AF%D8%AF)" title="۲۱ (عدد) (persa)" lang="fa" hreflang="fa" data-title="۲۱ (عدد)" data-language-autonym="فارسی" data-language-local-name="persa" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-ff mw-list-item"><a href="https://ff.wikipedia.org/wiki/Noogas_e_go%E2%80%99o" title="Noogas e go’o (fula)" lang="ff" hreflang="ff" data-title="Noogas e go’o" data-language-autonym="Fulfulde" data-language-local-name="fula" class="interlanguage-link-target"><span>Fulfulde</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/21_(luku)" title="21 (luku) (finés)" lang="fi" hreflang="fi" data-title="21 (luku)" data-language-autonym="Suomi" data-language-local-name="finés" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fj mw-list-item"><a href="https://fj.wikipedia.org/wiki/Rua_ka_dua" title="Rua ka dua (fiyiano)" lang="fj" hreflang="fj" data-title="Rua ka dua" data-language-autonym="Na Vosa Vakaviti" data-language-local-name="fiyiano" class="interlanguage-link-target"><span>Na Vosa Vakaviti</span></a></li><li class="interlanguage-link interwiki-fo mw-list-item"><a href="https://fo.wikipedia.org/wiki/21_(tal)" title="21 (tal) (feroés)" lang="fo" hreflang="fo" data-title="21 (tal)" data-language-autonym="Føroyskt" data-language-local-name="feroés" class="interlanguage-link-target"><span>Føroyskt</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/21_(nombre)" title="21 (nombre) (francés)" lang="fr" hreflang="fr" data-title="21 (nombre)" data-language-autonym="Français" data-language-local-name="francés" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/21_(uimhir)" title="21 (uimhir) (irlandés)" lang="ga" hreflang="ga" data-title="21 (uimhir)" data-language-autonym="Gaeilge" data-language-local-name="irlandés" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gan mw-list-item"><a href="https://gan.wikipedia.org/wiki/21" title="21 (chino gan)" lang="gan" hreflang="gan" data-title="21" data-language-autonym="贛語" data-language-local-name="chino gan" class="interlanguage-link-target"><span>贛語</span></a></li><li class="interlanguage-link interwiki-ha mw-list-item"><a href="https://ha.wikipedia.org/wiki/21_(al%C6%99alami)" title="21 (alƙalami) (hausa)" lang="ha" hreflang="ha" data-title="21 (alƙalami)" data-language-autonym="Hausa" data-language-local-name="hausa" class="interlanguage-link-target"><span>Hausa</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/21_(%D7%9E%D7%A1%D7%A4%D7%A8)" title="21 (מספר) (hebreo)" lang="he" hreflang="he" data-title="21 (מספר)" data-language-autonym="עברית" data-language-local-name="hebreo" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A5%A8%E0%A5%A7_(%E0%A4%B8%E0%A4%82%E0%A4%96%E0%A5%8D%E0%A4%AF%E0%A4%BE)" title="२१ (संख्या) (hindi)" lang="hi" hreflang="hi" data-title="२१ (संख्या)" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/21_(nonm)" title="21 (nonm) (criollo haitiano)" lang="ht" hreflang="ht" data-title="21 (nonm)" data-language-autonym="Kreyòl ayisyen" data-language-local-name="criollo haitiano" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/21_(sz%C3%A1m)" title="21 (szám) (húngaro)" lang="hu" hreflang="hu" data-title="21 (szám)" data-language-autonym="Magyar" data-language-local-name="húngaro" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/21_(%D5%A9%D5%AB%D5%BE)" title="21 (թիվ) (armenio)" lang="hy" hreflang="hy" data-title="21 (թիվ)" data-language-autonym="Հայերեն" data-language-local-name="armenio" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-ia mw-list-item"><a href="https://ia.wikipedia.org/wiki/21_(numero)" title="21 (numero) (interlingua)" lang="ia" hreflang="ia" data-title="21 (numero)" data-language-autonym="Interlingua" data-language-local-name="interlingua" class="interlanguage-link-target"><span>Interlingua</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/21_(angka)" title="21 (angka) (indonesio)" lang="id" hreflang="id" data-title="21 (angka)" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesio" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ig mw-list-item"><a href="https://ig.wikipedia.org/wiki/Iri_ab%E1%BB%A5o_na_otu" title="Iri abụo na otu (igbo)" lang="ig" hreflang="ig" data-title="Iri abụo na otu" data-language-autonym="Igbo" data-language-local-name="igbo" class="interlanguage-link-target"><span>Igbo</span></a></li><li class="interlanguage-link interwiki-ik mw-list-item"><a href="https://ik.wikipedia.org/wiki/I%C3%B1ui%C3%B1aq_atausiq" title="Iñuiñaq atausiq (inupiaq)" lang="ik" hreflang="ik" data-title="Iñuiñaq atausiq" data-language-autonym="Iñupiatun" data-language-local-name="inupiaq" class="interlanguage-link-target"><span>Iñupiatun</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/21_(numero)" title="21 (numero) (italiano)" lang="it" hreflang="it" data-title="21 (numero)" data-language-autonym="Italiano" data-language-local-name="italiano" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/21" title="21 (japonés)" lang="ja" hreflang="ja" data-title="21" data-language-autonym="日本語" data-language-local-name="japonés" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/21_(%E1%83%A0%E1%83%98%E1%83%AA%E1%83%AE%E1%83%95%E1%83%98)" title="21 (რიცხვი) (georgiano)" lang="ka" hreflang="ka" data-title="21 (რიცხვი)" data-language-autonym="ქართული" data-language-local-name="georgiano" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kcg mw-list-item"><a href="https://kcg.wikipedia.org/wiki/21_(la%CC%B1mba)" title="21 (la̱mba) (tyap)" lang="kcg" hreflang="kcg" data-title="21 (la̱mba)" data-language-autonym="Tyap" data-language-local-name="tyap" class="interlanguage-link-target"><span>Tyap</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/21" title="21 (coreano)" lang="ko" hreflang="ko" data-title="21" data-language-autonym="한국어" data-language-local-name="coreano" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ks mw-list-item"><a href="https://ks.wikipedia.org/wiki/21_(%DA%AF%D8%B1%D9%8E%D9%9B%D9%86%D9%9B%D8%AF)" title="21 (گرَٛنٛد) (cachemir)" lang="ks" hreflang="ks" data-title="21 (گرَٛنٛد)" data-language-autonym="कॉशुर / کٲشُر" data-language-local-name="cachemir" class="interlanguage-link-target"><span>कॉशुर / کٲشُر</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Viginti_unus" title="Viginti unus (latín)" lang="la" hreflang="la" data-title="Viginti unus" data-language-autonym="Latina" data-language-local-name="latín" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lbe mw-list-item"><a href="https://lbe.wikipedia.org/wiki/%D0%9A%D1%8C%D1%83%D0%BD%D0%B8%D1%8F_%D1%86%D0%B0%D0%B2%D0%B0" title="Кьуния цава (Lak)" lang="lbe" hreflang="lbe" data-title="Кьуния цава" data-language-autonym="Лакку" data-language-local-name="Lak" class="interlanguage-link-target"><span>Лакку</span></a></li><li class="interlanguage-link interwiki-lg mw-list-item"><a href="https://lg.wikipedia.org/wiki/Abiri_mu_emu" title="Abiri mu emu (ganda)" lang="lg" hreflang="lg" data-title="Abiri mu emu" data-language-autonym="Luganda" data-language-local-name="ganda" class="interlanguage-link-target"><span>Luganda</span></a></li><li class="interlanguage-link interwiki-ln mw-list-item"><a href="https://ln.wikipedia.org/wiki/21_(motuya)" title="21 (motuya) (lingala)" lang="ln" hreflang="ln" data-title="21 (motuya)" data-language-autonym="Lingála" data-language-local-name="lingala" class="interlanguage-link-target"><span>Lingála</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/21_(skai%C4%8Dius)" title="21 (skaičius) (lituano)" lang="lt" hreflang="lt" data-title="21 (skaičius)" data-language-autonym="Lietuvių" data-language-local-name="lituano" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/21_(skaitlis)" title="21 (skaitlis) (letón)" lang="lv" hreflang="lv" data-title="21 (skaitlis)" data-language-autonym="Latviešu" data-language-local-name="letón" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mai mw-list-item"><a href="https://mai.wikipedia.org/wiki/%E0%A5%A8%E0%A5%A7" title="२१ (maithili)" lang="mai" hreflang="mai" data-title="२१" data-language-autonym="मैथिली" data-language-local-name="maithili" class="interlanguage-link-target"><span>मैथिली</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/21_(%D0%B1%D1%80%D0%BE%D1%98)" title="21 (број) (macedonio)" lang="mk" hreflang="mk" data-title="21 (број)" data-language-autonym="Македонски" data-language-local-name="macedonio" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-mni mw-list-item"><a href="https://mni.wikipedia.org/wiki/%EA%AF%B2%EA%AF%B1" title="꯲꯱ (manipurí)" lang="mni" hreflang="mni" data-title="꯲꯱" data-language-autonym="ꯃꯤꯇꯩ ꯂꯣꯟ" data-language-local-name="manipurí" class="interlanguage-link-target"><span>ꯃꯤꯇꯩ ꯂꯣꯟ</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A5%A8%E0%A5%A7_(%E0%A4%B8%E0%A4%82%E0%A4%96%E0%A5%8D%E0%A4%AF%E0%A4%BE)" title="२१ (संख्या) (maratí)" lang="mr" hreflang="mr" data-title="२१ (संख्या)" data-language-autonym="मराठी" data-language-local-name="maratí" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/21_(nombor)" title="21 (nombor) (malayo)" lang="ms" hreflang="ms" data-title="21 (nombor)" data-language-autonym="Bahasa Melayu" data-language-local-name="malayo" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-myv mw-list-item"><a href="https://myv.wikipedia.org/wiki/21_(%D0%BB%D0%BE%D0%B2%D0%BE%D0%BC%D0%B0_%D0%B2%D0%B0%D0%BB)" title="21 (ловома вал) (erzya)" lang="myv" hreflang="myv" data-title="21 (ловома вал)" data-language-autonym="Эрзянь" data-language-local-name="erzya" class="interlanguage-link-target"><span>Эрзянь</span></a></li><li class="interlanguage-link interwiki-mzn mw-list-item"><a href="https://mzn.wikipedia.org/wiki/%DB%B2%DB%B1_(%D8%B9%D8%AF%D8%AF)" title="۲۱ (عدد) (mazandaraní)" lang="mzn" hreflang="mzn" data-title="۲۱ (عدد)" data-language-autonym="مازِرونی" data-language-local-name="mazandaraní" class="interlanguage-link-target"><span>مازِرونی</span></a></li><li class="interlanguage-link interwiki-nah mw-list-item"><a href="https://nah.wikipedia.org/wiki/C%C4%93mp%C5%8Dhualonc%C4%93" title="Cēmpōhualoncē (Nahuatl)" lang="nah" hreflang="nah" data-title="Cēmpōhualoncē" data-language-autonym="Nāhuatl" data-language-local-name="Nahuatl" class="interlanguage-link-target"><span>Nāhuatl</span></a></li><li class="interlanguage-link interwiki-nap mw-list-item"><a href="https://nap.wikipedia.org/wiki/Vint%C3%B9ne" title="Vintùne (napolitano)" lang="nap" hreflang="nap" data-title="Vintùne" data-language-autonym="Napulitano" data-language-local-name="napolitano" class="interlanguage-link-target"><span>Napulitano</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/21_(getal)" title="21 (getal) (neerlandés)" lang="nl" hreflang="nl" data-title="21 (getal)" data-language-autonym="Nederlands" data-language-local-name="neerlandés" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Talet_21" title="Talet 21 (noruego nynorsk)" lang="nn" hreflang="nn" data-title="Talet 21" data-language-autonym="Norsk nynorsk" data-language-local-name="noruego nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/21_(tall)" title="21 (tall) (noruego bokmal)" lang="nb" hreflang="nb" data-title="21 (tall)" data-language-autonym="Norsk bokmål" data-language-local-name="noruego bokmal" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nso mw-list-item"><a href="https://nso.wikipedia.org/wiki/21_(nomoro)" title="21 (nomoro) (sotho septentrional)" lang="nso" hreflang="nso" data-title="21 (nomoro)" data-language-autonym="Sesotho sa Leboa" data-language-local-name="sotho septentrional" class="interlanguage-link-target"><span>Sesotho sa Leboa</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/21_(liczba)" title="21 (liczba) (polaco)" lang="pl" hreflang="pl" data-title="21 (liczba)" data-language-autonym="Polski" data-language-local-name="polaco" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/21" title="21 (Western Punjabi)" lang="pnb" hreflang="pnb" data-title="21" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-ps mw-list-item"><a href="https://ps.wikipedia.org/wiki/%DB%B2%DB%B1_(%D8%B9%D8%AF%D8%AF)" title="۲۱ (عدد) (pastún)" lang="ps" hreflang="ps" data-title="۲۱ (عدد)" data-language-autonym="پښتو" data-language-local-name="pastún" class="interlanguage-link-target"><span>پښتو</span></a></li><li class="interlanguage-link interwiki-pt badge-Q70893996 mw-list-item" title=""><a href="https://pt.wikipedia.org/wiki/Vinte_e_um" title="Vinte e um (portugués)" lang="pt" hreflang="pt" data-title="Vinte e um" data-language-autonym="Português" data-language-local-name="portugués" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-rn mw-list-item"><a href="https://rn.wikipedia.org/wiki/Mirongo_ibiri_na_rimwe" title="Mirongo ibiri na rimwe (kirundi)" lang="rn" hreflang="rn" data-title="Mirongo ibiri na rimwe" data-language-autonym="Ikirundi" data-language-local-name="kirundi" class="interlanguage-link-target"><span>Ikirundi</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/21_(num%C4%83r)" title="21 (număr) (rumano)" lang="ro" hreflang="ro" data-title="21 (număr)" data-language-autonym="Română" data-language-local-name="rumano" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/21_(%D1%87%D0%B8%D1%81%D0%BB%D0%BE)" title="21 (число) (ruso)" lang="ru" hreflang="ru" data-title="21 (число)" data-language-autonym="Русский" data-language-local-name="ruso" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/21_(number)" title="21 (number) (Simple English)" lang="en-simple" hreflang="en-simple" data-title="21 (number)" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/21_(%C5%A1tevilo)" title="21 (število) (esloveno)" lang="sl" hreflang="sl" data-title="21 (število)" data-language-autonym="Slovenščina" data-language-local-name="esloveno" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sm mw-list-item"><a href="https://sm.wikipedia.org/wiki/21_(numera)" title="21 (numera) (samoano)" lang="sm" hreflang="sm" data-title="21 (numera)" data-language-autonym="Gagana Samoa" data-language-local-name="samoano" class="interlanguage-link-target"><span>Gagana Samoa</span></a></li><li class="interlanguage-link interwiki-so mw-list-item"><a href="https://so.wikipedia.org/wiki/21_(tiro)" title="21 (tiro) (somalí)" lang="so" hreflang="so" data-title="21 (tiro)" data-language-autonym="Soomaaliga" data-language-local-name="somalí" class="interlanguage-link-target"><span>Soomaaliga</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/21_(%D0%B1%D1%80%D0%BE%D1%98)" title="21 (број) (serbio)" lang="sr" hreflang="sr" data-title="21 (број)" data-language-autonym="Српски / srpski" data-language-local-name="serbio" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-srn mw-list-item"><a href="https://srn.wikipedia.org/wiki/Numro_21" title="Numro 21 (sranan tongo)" lang="srn" hreflang="srn" data-title="Numro 21" data-language-autonym="Sranantongo" data-language-local-name="sranan tongo" class="interlanguage-link-target"><span>Sranantongo</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/21_(tal)" title="21 (tal) (sueco)" lang="sv" hreflang="sv" data-title="21 (tal)" data-language-autonym="Svenska" data-language-local-name="sueco" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Ishirini_na_moja" title="Ishirini na moja (suajili)" lang="sw" hreflang="sw" data-title="Ishirini na moja" data-language-autonym="Kiswahili" data-language-local-name="suajili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/21" title="21 (tailandés)" lang="th" hreflang="th" data-title="21" data-language-autonym="ไทย" data-language-local-name="tailandés" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/21_(say%C4%B1)" title="21 (sayı) (turco)" lang="tr" hreflang="tr" data-title="21 (sayı)" data-language-autonym="Türkçe" data-language-local-name="turco" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/21_(%D1%81%D0%B0%D0%BD)" title="21 (сан) (tártaro)" lang="tt" hreflang="tt" data-title="21 (сан)" data-language-autonym="Татарча / tatarça" data-language-local-name="tártaro" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-tyv mw-list-item"><a href="https://tyv.wikipedia.org/wiki/21" title="21 (tuviniano)" lang="tyv" hreflang="tyv" data-title="21" data-language-autonym="Тыва дыл" data-language-local-name="tuviniano" class="interlanguage-link-target"><span>Тыва дыл</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/21_(%D1%87%D0%B8%D1%81%D0%BB%D0%BE)" title="21 (число) (ucraniano)" lang="uk" hreflang="uk" data-title="21 (число)" data-language-autonym="Українська" data-language-local-name="ucraniano" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/21_(%D8%B9%D8%AF%D8%AF)" title="21 (عدد) (urdu)" lang="ur" hreflang="ur" data-title="21 (عدد)" data-language-autonym="اردو" data-language-local-name="urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/21_(son)" title="21 (son) (uzbeko)" lang="uz" hreflang="uz" data-title="21 (son)" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="uzbeko" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vep mw-list-item"><a href="https://vep.wikipedia.org/wiki/21_(lugu)" title="21 (lugu) (Veps)" lang="vep" hreflang="vep" data-title="21 (lugu)" data-language-autonym="Vepsän kel’" data-language-local-name="Veps" class="interlanguage-link-target"><span>Vepsän kel’</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/21_(s%E1%BB%91)" title="21 (số) (vietnamita)" lang="vi" hreflang="vi" data-title="21 (số)" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-vls mw-list-item"><a href="https://vls.wikipedia.org/wiki/21_(getal)" title="21 (getal) (West Flemish)" lang="vls" hreflang="vls" data-title="21 (getal)" data-language-autonym="West-Vlams" data-language-local-name="West Flemish" class="interlanguage-link-target"><span>West-Vlams</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/21_(ihap)" title="21 (ihap) (waray)" lang="war" hreflang="war" data-title="21 (ihap)" data-language-autonym="Winaray" data-language-local-name="waray" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/21" title="21 (chino wu)" lang="wuu" hreflang="wuu" data-title="21" data-language-autonym="吴语" data-language-local-name="chino wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-xh mw-list-item"><a href="https://xh.wikipedia.org/wiki/Amashumi_amabini_ananye" title="Amashumi amabini ananye (xhosa)" lang="xh" hreflang="xh" data-title="Amashumi amabini ananye" data-language-autonym="IsiXhosa" data-language-local-name="xhosa" class="interlanguage-link-target"><span>IsiXhosa</span></a></li><li class="interlanguage-link interwiki-yi mw-list-item"><a href="https://yi.wikipedia.org/wiki/21_(%D7%A0%D7%95%D7%9E%D7%A2%D7%A8)" title="21 (נומער) (yidis)" lang="yi" hreflang="yi" data-title="21 (נומער)" data-language-autonym="ייִדיש" data-language-local-name="yidis" class="interlanguage-link-target"><span>ייִדיש</span></a></li><li class="interlanguage-link interwiki-za mw-list-item"><a href="https://za.wikipedia.org/wiki/21" title="21 (zhuang)" lang="za" hreflang="za" data-title="21" data-language-autonym="Vahcuengh" data-language-local-name="zhuang" class="interlanguage-link-target"><span>Vahcuengh</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/21" title="21 (chino)" lang="zh" hreflang="zh" data-title="21" data-language-autonym="中文" data-language-local-name="chino" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/21" title="21 (chino min nan)" lang="nan" hreflang="nan" data-title="21" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="chino min nan" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/21" title="21 (cantonés)" lang="yue" hreflang="yue" data-title="21" data-language-autonym="粵語" data-language-local-name="cantonés" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div 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</div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">De Wikipedia, la enciclopedia libre</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="es" dir="ltr"><div class="rellink noprint hatnote">Este artículo trata sobre el número 21. Para otros usos de este término, véase <a href="/wiki/21_(desambiguaci%C3%B3n)" class="mw-disambig" title="21 (desambiguación)">21 (desambiguación)</a>.</div> <style data-mw-deduplicate="TemplateStyles:r157776694">.mw-parser-output .infobox .imagen{max-width:100%;margin:0 auto}.mw-parser-output .infobox .imagen img{max-width:100%;height:auto}.mw-parser-output .infobox .mw-kartographer-container .thumbinner,.mw-parser-output .infobox .mw-kartographer-map{box-sizing:border-box;width:100%!important}body.skin-timeless .mw-parser-output .infobox .imagen a.image>img{max-width:100%!important;height:auto!important}</style><table class="infobox" style="width:22.7em; line-height: 1.4em; text-align:left; padding:.23em;"><tbody><tr><th colspan="3" class="cabecera física" style="text-align:center;background-color:#ccf;color:inherit;">21</th></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/N%C3%BAmero_cardinal" title="Número cardinal">Cardinal</a></th><td colspan="2"> Veintiuno</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/N%C3%BAmero_ordinal_(matem%C3%A1ticas)" class="mw-redirect" title="Número ordinal (matemáticas)">Ordinal</a></th><td colspan="2"> Vigésimo primero, -a</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Factorizaci%C3%B3n" title="Factorización">Factorización</a></th><td colspan="2"> 3 × 7</td></tr><tr><th colspan="3" style="text-align:center;background-color:#ccf;;"><a href="/wiki/Sistema_de_numeraci%C3%B3n" title="Sistema de numeración">Sistemas de numeración</a></th></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Numeraci%C3%B3n_romana" title="Numeración romana">Romana</a></th><td colspan="2"> XXI</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Numeraci%C3%B3n_%C3%A1tica" title="Numeración ática">Ática</a></th><td colspan="2"> ΔΔΙ</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Numeraci%C3%B3n_griega" title="Numeración griega">Jónica</a></th><td colspan="2"> κα</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Numeraci%C3%B3n_china" title="Numeración china">China</a></th><td colspan="2"> 二十一</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Numeraci%C3%B3n_china" title="Numeración china">China financiera</a></th><td colspan="2"> 貳拾壹</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Numeraci%C3%B3n_egipcia" title="Numeración egipcia">Egipcia</a></th><td colspan="2"> ⋂⋂I</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Numeraci%C3%B3n_armenia" title="Numeración armenia">Armenia</a></th><td colspan="2"> ԻԱ</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Numeraci%C3%B3n_maya" title="Numeración maya">Maya</a></th><td colspan="2"> <span typeof="mw:File"><a href="/wiki/Archivo:Maya_1.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Maya_1.svg/20px-Maya_1.svg.png" decoding="async" width="20" height="20" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Maya_1.svg/30px-Maya_1.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Maya_1.svg/40px-Maya_1.svg.png 2x" data-file-width="450" data-file-height="450" /></a></span> <br /> <span typeof="mw:File"><a href="/wiki/Archivo:Maya_1.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Maya_1.svg/20px-Maya_1.svg.png" decoding="async" width="20" height="20" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Maya_1.svg/30px-Maya_1.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Maya_1.svg/40px-Maya_1.svg.png 2x" data-file-width="450" data-file-height="450" /></a></span></td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Numeraci%C3%B3n_cir%C3%ADlica" title="Numeración cirílica">Cirílica</a></th><td colspan="2"> КА</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Numeraci%C3%B3n_de_la_Cultura_de_los_Campos_de_Urnas" class="mw-redirect" title="Numeración de la Cultura de los Campos de Urnas">De los Campos de Urnas</a></th><td colspan="2"> /\\\\</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Numeraci%C3%B3n_india" title="Numeración india">India</a></th><td colspan="2"> ௨௰௧</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Sistema_binario" title="Sistema binario">Sistema binario</a></th><td colspan="2"> 10101</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Sistema_octal" title="Sistema octal">Sistema octal</a></th><td colspan="2"> 25</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Sistema_hexadecimal" title="Sistema hexadecimal">Sistema hexadecimal</a></th><td colspan="2"> 15</td></tr><tr><th colspan="3" style="text-align:center;background-color:#ccf;;">Como parámetro de una <a href="/wiki/Funci%C3%B3n_matem%C3%A1tica" class="mw-redirect" title="Función matemática">función</a></th></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Funci%C3%B3n_%CF%86_de_Euler" title="Función φ de Euler">Función φ de Euler</a></th><td colspan="2"> 12</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Funci%C3%B3n_divisor" title="Función divisor">Función divisor</a></th><td colspan="2"> 4</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Funci%C3%B3n_de_M%C3%B6bius" title="Función de Möbius">Función de Möbius</a></th><td colspan="2"> 1</td></tr><tr><th scope="row" style="text-align:left;background-color:#ddf;;"><a href="/wiki/Funci%C3%B3n_de_Mertens" title="Función de Mertens">Función de Mertens</a></th><td colspan="2"> -2</td></tr><tr><td colspan="3" style="text-align:center;"><a href="/wiki/Anexo:N%C3%BAmeros" title="Anexo:Números">Lista de números</a></td></tr><tr><td class="noprint" colspan="3" style="text-align:left;"><div class="plainlinks wikidata-link" style="font-size: 0.85em">[<a href="https://www.wikidata.org/wiki/Q712477" class="extiw" title="d:Q712477">editar datos en Wikidata</a>]</div></td></tr></tbody></table> <p>El <b>veintiuno</b> (apocopado <i>veintiún</i>) (21) es el número natural que sigue al <a href="/wiki/Veinte" title="Veinte">20</a> y precede al <a href="/wiki/Veintid%C3%B3s" title="Veintidós">22</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Matemáticas"><span id="Matem.C3.A1ticas"></span>Matemáticas</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Veintiuno&action=edit&section=1" title="Editar sección: Matemáticas"><span>editar</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>El 21 es un <a href="/wiki/N%C3%BAmero_compuesto" title="Número compuesto">número compuesto</a>, que tiene los siguientes <a href="/wiki/Divisibilidad" title="Divisibilidad">factores propios</a>: <a href="/wiki/Uno" title="Uno">1</a>, <a href="/wiki/Tres" title="Tres">3</a> y <a href="/wiki/Siete" title="Siete">7</a>. Como la suma de sus factores es <a href="/wiki/Once" title="Once">11</a> < 21, se trata de un <a href="/wiki/N%C3%BAmero_defectivo" title="Número defectivo">número defectivo</a>. La suma de sus divisores <a href="/wiki/Uno" title="Uno">1</a>, <a href="/wiki/Tres" title="Tres">3</a>, <a href="/wiki/Siete" title="Siete">7</a>, 21 = <a href="/wiki/Treinta_y_dos" title="Treinta y dos">32</a>.<sup id="cite_ref-1" class="reference separada"><a href="#cite_note-1"><span class="corchete-llamada">[</span>1<span class="corchete-llamada">]</span></a></sup></li> <li>El 21 es el sexto <a href="/wiki/N%C3%BAmero_triangular" title="Número triangular">número triangular</a>, después del <a href="/wiki/Quince" title="Quince">quince</a> y antes del <a href="/wiki/Veintiocho" title="Veintiocho">veintiocho</a>.</li> <li>El 21 es el octavo término de la <a href="/wiki/Sucesi%C3%B3n_de_Fibonacci" title="Sucesión de Fibonacci">sucesión de Fibonacci</a>, después del <a href="/wiki/Trece" title="Trece">trece</a> y antes del <a href="/wiki/Treinta_y_cuatro" title="Treinta y cuatro">treinta y cuatro</a>.</li> <li>El 21 es el séptimo número de la secuencia de <a href="/wiki/N%C3%BAmero_de_la_suerte" title="Número de la suerte">números de la suerte</a>.</li> <li>Un <a href="/wiki/N%C3%BAmero_semiprimo" title="Número semiprimo">número semiprimo</a>.</li> <li><a href="/wiki/Entero_libre_de_cuadrados" title="Entero libre de cuadrados">Número libre de cuadrados</a>.</li> <li>Es un término de la <a href="/wiki/Sucesi%C3%B3n_de_Padovan" title="Sucesión de Padovan">sucesión de Padovan</a>.</li> <li><a href="/wiki/N%C3%BAmero_de_Motzkin" title="Número de Motzkin">Número de Motzkin</a>.</li> <li>Un <a href="/wiki/N%C3%BAmero_de_Harshad" title="Número de Harshad">número de Harshad</a> y un <a href="/wiki/N%C3%BAmero_de_Moran" title="Número de Moran">número de Moran</a>.</li> <li>Un <a href="/wiki/N%C3%BAmero_octogonal" title="Número octogonal">número octagonal</a>.</li> <li>La suma de los divisores de los primeros 5 <a href="/wiki/N%C3%BAmero_entero" title="Número entero">enteros</a> <a href="/wiki/N%C3%BAmero_positivo" title="Número positivo">positivos.</a></li> <li>La cantidad más pequeña de cuadrados de diferentes tamaños necesarios para la <a href="/wiki/Cuadratura_del_cuadrado" title="Cuadratura del cuadrado">cuadratura del cuadrado</a>.</li></ul> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/Archivo:Squaring_the_square.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/64/Squaring_the_square.svg/140px-Squaring_the_square.svg.png" decoding="async" width="140" height="140" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/64/Squaring_the_square.svg/210px-Squaring_the_square.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/64/Squaring_the_square.svg/280px-Squaring_the_square.svg.png 2x" data-file-width="450" data-file-height="450" /></a><figcaption><i><a href="/wiki/Cuadratura_del_cuadrado" title="Cuadratura del cuadrado">Cuadrado cuadrado "perfecto</a> de menor orden.</i></figcaption></figure> <ul><li><a href="/wiki/Lista_de_21_problemas_NP-completos_de_Karp" class="mw-redirect" title="Lista de 21 problemas NP-completos de Karp">Lista de 21 problemas NP-completos de Karp</a> son problemas computacionales famosos, que tratan sobre <a href="/wiki/Combinatoria" title="Combinatoria">combinatoria</a> y <a href="/wiki/Teor%C3%ADa_de_grafos" title="Teoría de grafos">teoría de grafos</a>.</li> <li>El 21º <a href="/wiki/N%C3%BAmero_primo" title="Número primo">número primo</a> es <a href="/wiki/Setenta_y_tres" title="Setenta y tres">73</a>.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Otras_ciencias">Otras ciencias</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Veintiuno&action=edit&section=2" title="Editar sección: Otras ciencias"><span>editar</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Es el <a href="/wiki/N%C3%BAmero_at%C3%B3mico" title="Número atómico">número atómico</a> del <a href="/wiki/Escandio" title="Escandio">Escandio</a>.</li> <li><a href="/wiki/Cat%C3%A1logo_Messier" title="Catálogo Messier">Objeto de Messier</a> <a href="/wiki/C%C3%BAmulo_abierto_M21" title="Cúmulo abierto M21">M21</a> es un <a href="/wiki/C%C3%BAmulo_abierto" title="Cúmulo abierto">cúmulo abierto</a> en la <a href="/wiki/Constelaci%C3%B3n" title="Constelación">constelación</a> de <a href="/wiki/Sagitario_(constelaci%C3%B3n)" title="Sagitario (constelación)">Sagitario</a>.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Véase_también"><span id="V.C3.A9ase_tambi.C3.A9n"></span>Véase también</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Veintiuno&action=edit&section=3" title="Editar sección: Véase también"><span>editar</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><i><a href="/wiki/21_gramos" title="21 gramos">21 gramos</a></i>, película de 2003.</li> <li><i><a href="/wiki/21:_Blackjack" class="mw-redirect" title="21: Blackjack">21: Blackjack</a></i>, película de 2008.</li> <li>Es la máxima puntuación de un jugador en una mano de <a href="/wiki/Blackjack" title="Blackjack">Blackjack</a> o Veintiuno.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Referencias">Referencias</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Veintiuno&action=edit&section=4" title="Editar sección: Referencias"><span>editar</span></a><span class="mw-editsection-bracket">]</span></span></div> <ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><span class="citation web"><a rel="nofollow" class="external text" href="https://everipedia.org/wiki/lang_en/21_(number)">«Número Veintiuno»</a>.</span><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fes.wikipedia.org%3AVeintiuno&rft.btitle=N%C3%BAmero+Veintiuno&rft.genre=book&rft_id=https%3A%2F%2Feveripedia.org%2Fwiki%2Flang_en%2F21_%28number%29&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> </ol><style data-mw-deduplicate="TemplateStyles:r161257576">.mw-parser-output .mw-authority-control{margin-top:1.5em}.mw-parser-output .mw-authority-control .navbox table{margin:0}.mw-parser-output .mw-authority-control .navbox hr:last-child{display:none}.mw-parser-output .mw-authority-control .navbox+.mw-mf-linked-projects{display:none}.mw-parser-output .mw-authority-control .mw-mf-linked-projects{display:flex;padding:0.5em;border:1px solid var(--border-color-base,#a2a9b1);background-color:var(--background-color-neutral,#eaecf0);color:var(--color-base,#202122)}.mw-parser-output .mw-authority-control .mw-mf-linked-projects ul li{margin-bottom:0}.mw-parser-output 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/></a></span> Datos:</span> <span class="uid"><a href="https://www.wikidata.org/wiki/Q712477" class="extiw" title="wikidata:Q712477">Q712477</a></span></li> <li><span style="white-space:nowrap;"><span typeof="mw:File"><a href="/wiki/Wikimedia_Commons" title="Commonscat"><img alt="Commonscat" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/15px-Commons-logo.svg.png" decoding="async" width="15" height="20" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/23px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></a></span> Multimedia:</span> <span class="uid"><span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:21_(number)">21 (number)</a></span> / <span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/Special:MediaSearch?type=image&search=%22Q712477%22">Q712477</a></span></span></li></ul> <hr /> </div></td></tr></tbody></table></div><div class="mw-mf-linked-projects hlist"> <ul><li><span style="white-space:nowrap;"><span typeof="mw:File"><a href="/wiki/Wikidata" title="Wikidata"><img alt="Wd" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/20px-Wikidata-logo.svg.png" decoding="async" width="20" height="11" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/30px-Wikidata-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/40px-Wikidata-logo.svg.png 2x" data-file-width="1050" data-file-height="590" /></a></span> Datos:</span> <span class="uid"><a href="https://www.wikidata.org/wiki/Q712477" class="extiw" title="wikidata:Q712477">Q712477</a></span></li> <li><span style="white-space:nowrap;"><span typeof="mw:File"><a href="/wiki/Wikimedia_Commons" title="Commonscat"><img alt="Commonscat" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/15px-Commons-logo.svg.png" decoding="async" width="15" height="20" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/23px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></a></span> Multimedia:</span> <span class="uid"><span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:21_(number)">21 (number)</a></span> / <span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/Special:MediaSearch?type=image&search=%22Q712477%22">Q712477</a></span></span></li></ul> </div></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Obtenido de «<a dir="ltr" href="https://es.wikipedia.org/w/index.php?title=Veintiuno&oldid=157558844">https://es.wikipedia.org/w/index.php?title=Veintiuno&oldid=157558844</a>»</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Especial:Categor%C3%ADas" title="Especial:Categorías">Categoría</a>: <ul><li><a href="/wiki/Categor%C3%ADa:N%C3%BAmeros_enteros" title="Categoría:Números enteros">Números enteros</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Categoría oculta: <ul><li><a href="/wiki/Categor%C3%ADa:Wikipedia:P%C3%A1ginas_con_plantillas_con_argumentos_duplicados" title="Categoría:Wikipedia:Páginas con plantillas con argumentos duplicados">Wikipedia:Páginas con plantillas con argumentos duplicados</a></li></ul></div></div> 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