A:
Positive:
1 x 2153138911 x 195739919 x 113323171 x 303259209 x 103021781 x 275691349 x 159611451 x 14839
Negative:
-1 x -21531389-11 x -1957399-19 x -1133231-71 x -303259-209 x -103021-781 x -27569-1349 x -15961-1451 x -14839
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 21,531,389, 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 | 21,531,389 | |
| -1 | -21,531,389 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,531,389.
Example:
1 x 21,531,389 = 21,531,389
and
-1 x -21,531,389 = 21,531,389
Notice both answers equal 21,531,389
With that explanation out of the way, let's continue. Next, we take the number 21,531,389 and divide it by 2:
21,531,389 ÷ 2 = 10,765,694.5
If the quotient is a whole number, then 2 and 10,765,694.5 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 | 21,531,389 | |
| -1 | -21,531,389 |
Now, we try dividing 21,531,389 by 3:
21,531,389 ÷ 3 = 7,177,129.6667
If the quotient is a whole number, then 3 and 7,177,129.6667 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 | 21,531,389 | |
| -1 | -21,531,389 |
Let's try dividing by 4:
21,531,389 ÷ 4 = 5,382,847.25
If the quotient is a whole number, then 4 and 5,382,847.25 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 | 21,531,389 | |
| -1 | 21,531,389 |
If you did it right, you will end up with this table:
| 1 | 11 | 19 | 71 | 209 | 781 | 1,349 | 1,451 | 14,839 | 15,961 | 27,569 | 103,021 | 303,259 | 1,133,231 | 1,957,399 | 21,531,389 |
| -1 | -11 | -19 | -71 | -209 | -781 | -1,349 | -1,451 | -14,839 | -15,961 | -27,569 | -103,021 | -303,259 | -1,133,231 | -1,957,399 | -21,531,389 |
Here are some more numbers to try:
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