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21（二十一、廿一、にじゅういち、はたひと、はたちあまりひとつ）は、自然数、また整数において、20 の次で 22 の前の数である。

==Events==

Absalon (c. 1128 – March 21, 1201) was a Danish archbishop and statesman.

Alfonso or Alphonse (11 November 1220 – 21 August 1271) was the Count of Poitou from 1225 and Count ...

Saint Anselm of Canterbury (1033 – April 21 1109) was an Italian medieval philosopher, theologian, ...

==Events==

Abdülhamid I (Ottoman Turkish: عبد الحميد اول `Abdü’l-Ḥamīd-i evvel) (March 20, 1725 – April 7, 1789 ...

Abdülhamid II (Ottoman Turkish: عبد الحميد ثانی , ) (September 21, 1842 – February 10, 1918) was the ...

Abertillery () is a town in the county borough of Blaenau Gwent and the traditional county of Monmou ...

Andrzej Sapkowski, born June 21, 1948 in Łódź, is a Polish fantasy writer. Sapkowski studied economi ...

Anaïs Nin (February 21 1903 - January 14 1977) was a French-born author of Spanish, Cuban, and Dani ...

Baruch de Spinoza (, , ) (November 24, 1632 – February 21, 1677) was a Dutch philosopher of Portugue ...

President François Bozizé says that one of his priorities is to get the support of the international ...

|feast_day=21 November; 24 November in Ireland

Charles Martin "Chuck" Jones (September 21, 1912 – February 22, 2002) was an American anim ...

Clarence Leonard "Kelly" Johnson (February 27, 1910 - December 21, 1990) was an aircraft e ...

Cyril Michael Kornbluth (July 23, 1923–March 21, 1958 — pen-names: Cecil Corwin, S.D.

It is the most common day for autumn to end in the Northern Hemisphere and for spring to end in the ...

The English Channel (, "the sleeve") is an arm of the Atlantic Ocean that separates the is ...

Ethan Allen (January 21 1738Allen was born when Britain and her colonies still used the Old Style (O ...

Eric Hoffer (July 25 1898 – May 21 1983) was an American social writer. He produced ten books and wa ...

Ernest Lawrence Thayer (August 14, 1863 - August 21, 1940) was an American writer and poet who wrote ...

Ezekiel () is a prophet in the Hebrew Bible of the Book of Ezekiel. He is commemorated as a saint in ...

Nitrox refers to any gas mixture composed (excluding trace gases) of nitrogen and oxygen; this inclu ...

Ezra Abbot (April 28, 1819, Jackson, Maine–March 21, 1884, Cambridge, Massachusetts) was an American ...

Enron Creditors Recovery Corporation (formerly Enron Corporation) (former NYSE ticker symbol: ENE) w ...

Empress Genshō (元正天皇 Genshō-tennō) (680 – April 21, 748) was the 44th imperial ruler of Japan, accor ...

was the 54th emperor of Japan, according to the traditional order of succession. He reigned from 833 ...

==Events==

The F-5A/B Freedom Fighter and F-5E/F Tiger II are part of a family of widely used light supersonic ...

Frederick III of Habsburg (September 21 1415 – August 19, 1493) was elected as German King as the su ...