21 has two prime factors.
No, 21 and 23 are not twin prime numbers. Twin primes are pairs of prime numbers that differ by 2, such as 3 and 5, or 11 and 13.
The prime numbers between 10 and 21 are 11, 13, 17, and 19.
factors of 21: 3, 7 prime factors of 21: 3, 7
There are 21 two-digit prime numbers.
21
Do you mean, "What is the prime factorization of 21?"
21 is not prime.
21
21 has two prime factors.
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 3 prime numbers from 21 to 35:23, 29 and 31
The prime factors of 21 are 3 x 7.
17 is a prime number, but 21 is not (21 = 3 * 7).
21 is not a prime.
11 is a prime number but 21 is not a prime number as it is divisible by 3.