21

Letters that make 21

1, 2 are letters that make '21'

are words within '21'

12 is an anagram of '21'

2 possible definitions for '21'

Under this definition, 21 is a noun and has the following properties:

twenty-one, XXI have the same meaning as '21'

'21' can be a type of large integer.

Under this definition, 21 is an adjective and has the following properties:

twenty-one, xxi have the same meaning as '21'

cardinal is similar to 21.