How to spell 21st
Here we will spell the ordinal number 21st. In other words, we will show you how to spell and write out 21st using letters only.
This is how to spell out 21st:
21st or twenty-first is the ordinal version of the cardinal number 21.
Now that you know how to spell 21st, you may also be interested to know that 21 is spelled twenty-one.