21

Twenty-one, XXI or 21 may refer to:


 * 21 (number), the natural number following 20 and preceding 22
 * The years 21 BC, AD 21, 1921, 2021

Films

 * 21 (2008 film), starring Kevin Spacey, Laurence Fishburne, Jim Sturgess, and Kate Bosworth
 * Twenty-One (1991 film), starring Patsy Kensit
 * Twenty-One (1923 film), starring Richard Barthelmess
 * Twenty-One (1918 film), starring Bryant Washburn

Science

 * Scandium, an transition metal in the periodic table
 * 21 Lutetia, an asteroid in the asteroid belt

Music

 * XXI (band), a band formerly known as A Feast for Kings
 * Twenty One Pilots, American musical duo
 * 21 Savage, an Atlanta-based rapper

Albums

 * 21 (EP), a 2015 EP by Hunter Hayes
 * 21 (Omarion album), 2006
 * 21 (Adele album), 2011
 * 21 (Rage album), 2012


 * Twenty One (Geri Allen album), 1994
 * Twenty One (Mystery Jets album), 2008
 * Twenty 1, a 1991 album by Chicago
 * XXI, a 2015 box set by Rammstein

Songs

 * "21" (The Paddingtons song), 2004
 * "21" (Hunter Hayes song), 2015
 * "21" (Polo G song), 2020
 * "21", a song by Corey Hart on Young Man Running
 * "21", a song by Craig Davis from 22 (2022)
 * "21", a song by DaBaby from Blank Blank
 * "21", a song by Dean from 130 mood: TRBL
 * "21", a song by Gracie Abrams on Minor (EP)
 * "21", a 2015 song by Cory Marks from This Man
 * "21", a 2010 song by Flo Rida from Only One Flo (Part 1)
 * "21", a 2018 song by Mitch James
 * 21?!, a 2008 song and EP by Marya Roxx
 * "Twenty One", a song by The Shirelles
 * "Twenty One", a song by Khalid from Free Spirit
 * "Twenty-One", a song by The Eagles from Desperado
 * "Twenty One", a song by The Cranberries from No Need to Argue
 * "Twenty One", a song by Corey Smith

Games and sports

 * Twenty-One (card game), forerunner of Blackjack and Pontoon
 * 21 (drinking game), a counting game
 * 21, also "Counting to 21 game" or "21 game", a Nim-style counting game
 * Twenty-one (basketball), a basketball variation
 * Twenty-One (game show), an American game show from 1956 to 1958 and in 2000
 * Catch 21, an American game show based on Blackjack

Other uses

 * 21 (novel) or The Final Unfinished Voyage of Jack Aubrey, by Patrick O'Brian, 2004
 * "21" (Boardwalk Empire), an episode of the Boardwalk Empire television series
 * 21 Club, a former restaurant and nightclub in New York City
 * Twentyone Lake, a lake in Minnesota