21 In Words


This page can be used as a quick number reference and to learn how to spell and say 21 in its cardinal form and also 21st (ordinal number).

21 in words as a cardinal number is:


21 in words as an ordinal number (21st) is:


Number Facts

Odd or Even?
21 is an odd number.
Prime Number?
21 is not a prime number.
Natural Number?
21 is a natural number following 20 and preceding 22.