21.
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31 and 41 are prime numbers because they have only two factors
The numbers 31, 37 and 41 are prime (including the boundaries).
31, 37 and 41 are all prime numbers
There is an infinite number of prime numbers that are greater than 21. The next prime number after 21 is 23.
Only 1 between 31 - 41.It is 37.