There are 2 primes between 21 and 29 inclusive: 23 & 29.
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Four. The prime numbers between 10 and 21 are 11, 13, 17, and 19.
The prime numbers between 10 and 21 are 11, 13, 17, and 19.
If you include '101', there are 21 of them.
21 has two prime factors.
There are 21 two-digit prime numbers.