21

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

• 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

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

• 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

• 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

• 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

• 021 (disambiguation)
• Twenty to One, a 1935 British musical comedy
• List of highways numbered 21