Q: What are the prime factors of the number 221,034,240?

 A: 2, 3, 5, 7, 2741

Why are those the prime factors of the number 221,034,240?

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 221,034,240

221,034,240
Factor Arrows
2110,517,120
Factor Arrows
255,258,560
Factor Arrows
227,629,280
Factor Arrows
213,814,640
Factor Arrows
26,907,320
Factor Arrows
23,453,660
Factor Arrows
21,726,830
Factor Arrows
2863,415
Factor Arrows
3287,805
Factor Arrows
395,935
Factor Arrows
519,187
Factor Arrows
72,741

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, 3, 5, 7, 2741

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 3 x 3 x 5 x 7 x 2,741 = 221,034,240

This can also be written as 28 x 32 x 51 x 71 x 2,7411 = 221,034,240

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


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