**Find the prime factorization of 21**

**Step 1:**

Check if number is divisible by 3

Here 21 is divisible by 3 and gives number 7

**Step 2:**

Check if number 7 is divisible by 3 –> NO

Number 7 is divisible by 7 and gives number 1

**PRIME FACTORS**

The number 21 = 3 * 7 are the product of prime factors.

**INDIVIDUAL FACTORS**

If you want to know individual factors you can write can do following manipulations

a. first 1 and 21 are definitely the factors of 21

b. we can find other factors by choosing combinations of other prime factors.

**Hence the factors of 21 are****1, 3, 7, 21**