A:
Positive:
1 x 2147128113 x 165163729 x 740389169 x 127049337 x 63713377 x 569532197 x 97734381 x 4901
Negative:
-1 x -21471281-13 x -1651637-29 x -740389-169 x -127049-337 x -63713-377 x -56953-2197 x -9773-4381 x -4901
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 21,471,281, 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 | 21,471,281 | |
| -1 | -21,471,281 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,471,281.
Example:
1 x 21,471,281 = 21,471,281
and
-1 x -21,471,281 = 21,471,281
Notice both answers equal 21,471,281
With that explanation out of the way, let's continue. Next, we take the number 21,471,281 and divide it by 2:
21,471,281 ÷ 2 = 10,735,640.5
If the quotient is a whole number, then 2 and 10,735,640.5 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 | 21,471,281 | |
| -1 | -21,471,281 |
Now, we try dividing 21,471,281 by 3:
21,471,281 ÷ 3 = 7,157,093.6667
If the quotient is a whole number, then 3 and 7,157,093.6667 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 | 21,471,281 | |
| -1 | -21,471,281 |
Let's try dividing by 4:
21,471,281 ÷ 4 = 5,367,820.25
If the quotient is a whole number, then 4 and 5,367,820.25 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 | 21,471,281 | |
| -1 | 21,471,281 |
If you did it right, you will end up with this table:
| 1 | 13 | 29 | 169 | 337 | 377 | 2,197 | 4,381 | 4,901 | 9,773 | 56,953 | 63,713 | 127,049 | 740,389 | 1,651,637 | 21,471,281 |
| -1 | -13 | -29 | -169 | -337 | -377 | -2,197 | -4,381 | -4,901 | -9,773 | -56,953 | -63,713 | -127,049 | -740,389 | -1,651,637 | -21,471,281 |
Here are some more numbers to try:
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