Q: What is the prime factorization of the number 11,212,362?

 A:
  • The prime factors are: 2 x 3 x 3 x 7 x 23 x 53 x 73
    • or also written as { 2, 3, 3, 7, 23, 53, 73 }
  • Written in exponential form: 21 x 32 x 71 x 231 x 531 x 731

Why is the prime factorization of 11,212,362 written as 21 x 32 x 71 x 231 x 531 x 731?

What is prime factorization?

Prime factorization or prime factor decomposition is the process of finding which prime numbers can be multiplied together to make the original number.

Finding the prime factors of 11,212,362

To find the prime factors, you start by dividing the number by the first prime number, which is 2. If there is not a remainder, meaning you can divide evenly, then 2 is a factor of the number. Continue dividing by 2 until you cannot divide evenly anymore. Write down how many 2's you were able to divide by evenly. Now try dividing by the next prime factor, which is 3. The goal is to get to a quotient of 1.

If it doesn't make sense yet, let's try it...

Here are the first several prime factors: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29...

Let's start by dividing 11,212,362 by 2

11,212,362 ÷ 2 = 5,606,181 - No remainder! 2 is one of the factors!
5,606,181 ÷ 2 = 2,803,090.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
5,606,181 ÷ 3 = 1,868,727 - No remainder! 3 is one of the factors!
1,868,727 ÷ 3 = 622,909 - No remainder! 3 is one of the factors!
622,909 ÷ 3 = 207,636.3333 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
622,909 ÷ 5 = 124,581.8 - This has a remainder. 5 is not a factor.
622,909 ÷ 7 = 88,987 - No remainder! 7 is one of the factors!
88,987 ÷ 7 = 12,712.4286 - There is a remainder. We can't divide by 7 evenly anymore. Let's try the next prime number
88,987 ÷ 11 = 8,089.7273 - This has a remainder. 11 is not a factor.
88,987 ÷ 13 = 6,845.1538 - This has a remainder. 13 is not a factor.
88,987 ÷ 17 = 5,234.5294 - This has a remainder. 17 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
88,987 ÷ 23 = 3,869 - No remainder! 23 is one of the factors!
3,869 ÷ 23 = 168.2174 - There is a remainder. We can't divide by 23 evenly anymore. Let's try the next prime number
3,869 ÷ 29 = 133.4138 - This has a remainder. 29 is not a factor.
3,869 ÷ 31 = 124.8065 - This has a remainder. 31 is not a factor.
3,869 ÷ 37 = 104.5676 - This has a remainder. 37 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
3,869 ÷ 53 = 73 - No remainder! 53 is one of the factors!
73 ÷ 53 = 1.3774 - There is a remainder. We can't divide by 53 evenly anymore. Let's try the next prime number
73 ÷ 59 = 1.2373 - This has a remainder. 59 is not a factor.
73 ÷ 61 = 1.1967 - This has a remainder. 61 is not a factor.
73 ÷ 67 = 1.0896 - This has a remainder. 67 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
73 ÷ 73 = 1 - No remainder! 73 is one of the factors!

The orange divisor(s) above are the prime factors of the number 11,212,362. If we put all of it together we have the factors 2 x 3 x 3 x 7 x 23 x 53 x 73 = 11,212,362. It can also be written in exponential form as 21 x 32 x 71 x 231 x 531 x 731.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 11,212,362.

11,212,362
Factor Arrows
25,606,181
Factor Arrows
31,868,727
Factor Arrows
3622,909
Factor Arrows
788,987
Factor Arrows
233,869
Factor Arrows
5373

More Prime Factorization Examples

11,212,36011,212,36111,212,36311,212,364
23 x 51 x 591 x 4,75114011 x 27,961111,212,363122 x 2,803,0911

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