A:
Positive:
1 x 213708537 x 305297917 x 125710947 x 454699119 x 179587329 x 64957799 x 267473821 x 5593
Negative:
-1 x -21370853-7 x -3052979-17 x -1257109-47 x -454699-119 x -179587-329 x -64957-799 x -26747-3821 x -5593
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 21,370,853, 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 | 21,370,853 | |
| -1 | -21,370,853 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,370,853.
Example:
1 x 21,370,853 = 21,370,853
and
-1 x -21,370,853 = 21,370,853
Notice both answers equal 21,370,853
With that explanation out of the way, let's continue. Next, we take the number 21,370,853 and divide it by 2:
21,370,853 ÷ 2 = 10,685,426.5
If the quotient is a whole number, then 2 and 10,685,426.5 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 | 21,370,853 | |
| -1 | -21,370,853 |
Now, we try dividing 21,370,853 by 3:
21,370,853 ÷ 3 = 7,123,617.6667
If the quotient is a whole number, then 3 and 7,123,617.6667 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 | 21,370,853 | |
| -1 | -21,370,853 |
Let's try dividing by 4:
21,370,853 ÷ 4 = 5,342,713.25
If the quotient is a whole number, then 4 and 5,342,713.25 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 | 21,370,853 | |
| -1 | 21,370,853 |
If you did it right, you will end up with this table:
| 1 | 7 | 17 | 47 | 119 | 329 | 799 | 3,821 | 5,593 | 26,747 | 64,957 | 179,587 | 454,699 | 1,257,109 | 3,052,979 | 21,370,853 |
| -1 | -7 | -17 | -47 | -119 | -329 | -799 | -3,821 | -5,593 | -26,747 | -64,957 | -179,587 | -454,699 | -1,257,109 | -3,052,979 | -21,370,853 |
Here are some more numbers to try:
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