There are two different numbers. 3 and 7
Two.
21 has two prime factors.
There are 3 prime numbers from 21 to 35:23, 29 and 31
There are 21 two-digit prime numbers.
Four. The prime numbers between 10 and 21 are 11, 13, 17, and 19.
Do you mean, "What is the prime factorization of 21?"
21 is not prime.
21
there are 3 prime numbers in between 21 and 33... they are 23,29, 31.
The prime numbers from 21 to 40 are 23, 29, 31, and 37.
7 and 3 are prime numbers but 21 is a composite nuber
there are 50 prime numbers between 1-100 and of them 2,3,5,7 are single digit so that would leave 46 double digit prime numbers between 1-100