A:
Positive:
1 x 1516222123 x 65922761 x 248561101 x 150121107 x 1417031403 x 108072323 x 65272461 x 6161
Negative:
-1 x -15162221-23 x -659227-61 x -248561-101 x -150121-107 x -141703-1403 x -10807-2323 x -6527-2461 x -6161
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 15,162,221, 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 | 15,162,221 | |
| -1 | -15,162,221 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 15,162,221.
Example:
1 x 15,162,221 = 15,162,221
and
-1 x -15,162,221 = 15,162,221
Notice both answers equal 15,162,221
With that explanation out of the way, let's continue. Next, we take the number 15,162,221 and divide it by 2:
15,162,221 ÷ 2 = 7,581,110.5
If the quotient is a whole number, then 2 and 7,581,110.5 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 | 15,162,221 | |
| -1 | -15,162,221 |
Now, we try dividing 15,162,221 by 3:
15,162,221 ÷ 3 = 5,054,073.6667
If the quotient is a whole number, then 3 and 5,054,073.6667 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 | 15,162,221 | |
| -1 | -15,162,221 |
Let's try dividing by 4:
15,162,221 ÷ 4 = 3,790,555.25
If the quotient is a whole number, then 4 and 3,790,555.25 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 | 15,162,221 | |
| -1 | 15,162,221 |
If you did it right, you will end up with this table:
| 1 | 23 | 61 | 101 | 107 | 1,403 | 2,323 | 2,461 | 6,161 | 6,527 | 10,807 | 141,703 | 150,121 | 248,561 | 659,227 | 15,162,221 |
| -1 | -23 | -61 | -101 | -107 | -1,403 | -2,323 | -2,461 | -6,161 | -6,527 | -10,807 | -141,703 | -150,121 | -248,561 | -659,227 | -15,162,221 |
Here are some more numbers to try:
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