A:
Positive:
1 x 2121103723 x 92221931 x 68422771 x 298747419 x 50623713 x 297491633 x 129892201 x 9637
Negative:
-1 x -21211037-23 x -922219-31 x -684227-71 x -298747-419 x -50623-713 x -29749-1633 x -12989-2201 x -9637
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 21,211,037, 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 | 21,211,037 | |
| -1 | -21,211,037 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,211,037.
Example:
1 x 21,211,037 = 21,211,037
and
-1 x -21,211,037 = 21,211,037
Notice both answers equal 21,211,037
With that explanation out of the way, let's continue. Next, we take the number 21,211,037 and divide it by 2:
21,211,037 ÷ 2 = 10,605,518.5
If the quotient is a whole number, then 2 and 10,605,518.5 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 | 21,211,037 | |
| -1 | -21,211,037 |
Now, we try dividing 21,211,037 by 3:
21,211,037 ÷ 3 = 7,070,345.6667
If the quotient is a whole number, then 3 and 7,070,345.6667 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 | 21,211,037 | |
| -1 | -21,211,037 |
Let's try dividing by 4:
21,211,037 ÷ 4 = 5,302,759.25
If the quotient is a whole number, then 4 and 5,302,759.25 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 | 21,211,037 | |
| -1 | 21,211,037 |
If you did it right, you will end up with this table:
| 1 | 23 | 31 | 71 | 419 | 713 | 1,633 | 2,201 | 9,637 | 12,989 | 29,749 | 50,623 | 298,747 | 684,227 | 922,219 | 21,211,037 |
| -1 | -23 | -31 | -71 | -419 | -713 | -1,633 | -2,201 | -9,637 | -12,989 | -29,749 | -50,623 | -298,747 | -684,227 | -922,219 | -21,211,037 |
Here are some more numbers to try:
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