What is the prime factors of 21?

The prime factors of 21 are the prime numbers that can divide 21 without leaving a remainder.

To find the prime factors of 21, we can start by dividing 21 by the smallest prime number, 2. However, 21 is not divisible by 2.

Next, we try dividing 21 by the next prime number, 3. 21 divided by 3 equals 7, with no remainder. Therefore, 3 is a prime factor of 21.

Since 7 is a prime number, we cannot divide it further. Therefore, the prime factorization of 21 is 3 * 7.