A:
Positive:
1 x 13124002111 x 1193091171 x 1848451197 x 666193781 x 168041853 x 1538572167 x 605639383 x 13987
Negative:
-1 x -131240021-11 x -11930911-71 x -1848451-197 x -666193-781 x -168041-853 x -153857-2167 x -60563-9383 x -13987
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 131,240,021, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 131,240,021 | |
| -1 | -131,240,021 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 131,240,021.
Example:
1 x 131,240,021 = 131,240,021
and
-1 x -131,240,021 = 131,240,021
Notice both answers equal 131,240,021
With that explanation out of the way, let's continue. Next, we take the number 131,240,021 and divide it by 2:
131,240,021 ÷ 2 = 65,620,010.5
If the quotient is a whole number, then 2 and 65,620,010.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 131,240,021 | |
| -1 | -131,240,021 |
Now, we try dividing 131,240,021 by 3:
131,240,021 ÷ 3 = 43,746,673.6667
If the quotient is a whole number, then 3 and 43,746,673.6667 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 131,240,021 | |
| -1 | -131,240,021 |
Let's try dividing by 4:
131,240,021 ÷ 4 = 32,810,005.25
If the quotient is a whole number, then 4 and 32,810,005.25 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 131,240,021 | |
| -1 | 131,240,021 |
If you did it right, you will end up with this table:
| 1 | 11 | 71 | 197 | 781 | 853 | 2,167 | 9,383 | 13,987 | 60,563 | 153,857 | 168,041 | 666,193 | 1,848,451 | 11,930,911 | 131,240,021 |
| -1 | -11 | -71 | -197 | -781 | -853 | -2,167 | -9,383 | -13,987 | -60,563 | -153,857 | -168,041 | -666,193 | -1,848,451 | -11,930,911 | -131,240,021 |
Here are some more numbers to try:
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