Q: What are the prime factors of the number 22,021,120?

 A: 2, 5, 11, 17, 23

Why are those the prime factors of the number 22,021,120?

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 22,021,120

22,021,120
Factor Arrows
211,010,560
Factor Arrows
25,505,280
Factor Arrows
22,752,640
Factor Arrows
21,376,320
Factor Arrows
2688,160
Factor Arrows
2344,080
Factor Arrows
2172,040
Factor Arrows
286,020
Factor Arrows
243,010
Factor Arrows
221,505
Factor Arrows
54,301
Factor Arrows
11391
Factor Arrows
1723

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:

2, 5, 11, 17, 23

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 5 x 11 x 17 x 23 = 22,021,120

This can also be written as 210 x 51 x 111 x 171 x 231 = 22,021,120

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


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