# Factors of 21

Factors of 21 are the integers that can divide 21 without producing remainders. Factors of 21 can also be referred to as the divisors of 21. In this guide, you will learn how to find the factors of 21.

The Factors of 21 are:

1,3,7,21

How to find the factors of 21

Step 1: Divide 21 by all whole numbers less or equal to 21

Step 2: Pick only the numbers without decimal points

1,3,7,21

1. What is the biggest factor of 21?

21

2. What is the smallest factor of 21?

1

3. What is the difference between Prime factors and factors?

Let’s take 21 as an example. The prime factors of 21 are the divisors that cannot be broken down any further. In this case, the Prime factors are 3 X 7.

Conversely, the factors are all the numbers that can be multiplied with another number to produce 21. Note that factor pairs can be broken down further. In this case, the factors are: 1,3,7,21

4. What is the Sum of factors of 21?

When you add all the factors of 21 the result is:

32

5. How many factors does 21  have?

4

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