+**21** is a [natural number](/wiki/natural_number) that follows 20. It often signifies a turning point, especially as an [age](/wiki/age) of maturity. This number also features prominently in games of chance and skill.
+## See also
+- [Prime Number](/wiki/prime_number)
+- [Blackjack](/wiki/blackjack)
+- [Dice](/wiki/dice)
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