A:
Positive:
1 x 210331317 x 300473317 x 123724337 x 568463119 x 176749259 x 81209281 x 74851289 x 72779629 x 334391967 x 106932023 x 103974403 x 4777
Negative:
-1 x -21033131-7 x -3004733-17 x -1237243-37 x -568463-119 x -176749-259 x -81209-281 x -74851-289 x -72779-629 x -33439-1967 x -10693-2023 x -10397-4403 x -4777
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 21,033,131, 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 | 21,033,131 | |
| -1 | -21,033,131 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,033,131.
Example:
1 x 21,033,131 = 21,033,131
and
-1 x -21,033,131 = 21,033,131
Notice both answers equal 21,033,131
With that explanation out of the way, let's continue. Next, we take the number 21,033,131 and divide it by 2:
21,033,131 ÷ 2 = 10,516,565.5
If the quotient is a whole number, then 2 and 10,516,565.5 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 | 21,033,131 | |
| -1 | -21,033,131 |
Now, we try dividing 21,033,131 by 3:
21,033,131 ÷ 3 = 7,011,043.6667
If the quotient is a whole number, then 3 and 7,011,043.6667 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 | 21,033,131 | |
| -1 | -21,033,131 |
Let's try dividing by 4:
21,033,131 ÷ 4 = 5,258,282.75
If the quotient is a whole number, then 4 and 5,258,282.75 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 | 21,033,131 | |
| -1 | 21,033,131 |
If you did it right, you will end up with this table:
| 1 | 7 | 17 | 37 | 119 | 259 | 281 | 289 | 629 | 1,967 | 2,023 | 4,403 | 4,777 | 10,397 | 10,693 | 33,439 | 72,779 | 74,851 | 81,209 | 176,749 | 568,463 | 1,237,243 | 3,004,733 | 21,033,131 |
| -1 | -7 | -17 | -37 | -119 | -259 | -281 | -289 | -629 | -1,967 | -2,023 | -4,403 | -4,777 | -10,397 | -10,693 | -33,439 | -72,779 | -74,851 | -81,209 | -176,749 | -568,463 | -1,237,243 | -3,004,733 | -21,033,131 |
Here are some more numbers to try:
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