Q: What are the prime factors of the number 21,111?

Why are those the prime factors of the number 21,111?

Prime factors are the prime numbers that can be multipled together to equal the original number. You find the factors by dividing by prime numbers. It is best shown by creating a Factor Tree.

Factor Tree for the number 21,111

	21,111
3		7,037
	31		227

The numbers in bold above are the prime factors. If there are multiples, you only count them one time. This leads us to our prime factors of:

3, 31, 227

We can check our work by multiplying all of the prime factors together: 3 x 31 x 227 = 21,111

This can also be written as 3¹ x 31¹ x 227¹ = 21,111

If you would like to know more, or need additional explanation, please review our prime factorization explanation.

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