A:
Positive:
1 x 210374717 x 300535313 x 161826791 x 231181151 x 1393211057 x 199031531 x 137411963 x 10717
Negative:
-1 x -21037471-7 x -3005353-13 x -1618267-91 x -231181-151 x -139321-1057 x -19903-1531 x -13741-1963 x -10717
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 21,037,471, 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 | 21,037,471 | |
| -1 | -21,037,471 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,037,471.
Example:
1 x 21,037,471 = 21,037,471
and
-1 x -21,037,471 = 21,037,471
Notice both answers equal 21,037,471
With that explanation out of the way, let's continue. Next, we take the number 21,037,471 and divide it by 2:
21,037,471 ÷ 2 = 10,518,735.5
If the quotient is a whole number, then 2 and 10,518,735.5 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 | 21,037,471 | |
| -1 | -21,037,471 |
Now, we try dividing 21,037,471 by 3:
21,037,471 ÷ 3 = 7,012,490.3333
If the quotient is a whole number, then 3 and 7,012,490.3333 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 | 21,037,471 | |
| -1 | -21,037,471 |
Let's try dividing by 4:
21,037,471 ÷ 4 = 5,259,367.75
If the quotient is a whole number, then 4 and 5,259,367.75 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 | 21,037,471 | |
| -1 | 21,037,471 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 91 | 151 | 1,057 | 1,531 | 1,963 | 10,717 | 13,741 | 19,903 | 139,321 | 231,181 | 1,618,267 | 3,005,353 | 21,037,471 |
| -1 | -7 | -13 | -91 | -151 | -1,057 | -1,531 | -1,963 | -10,717 | -13,741 | -19,903 | -139,321 | -231,181 | -1,618,267 | -3,005,353 | -21,037,471 |
Here are some more numbers to try:
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