A:
Positive:
1 x 2125834711 x 193257717 x 125049179 x 269093187 x 113681869 x 244631343 x 158291439 x 14773
Negative:
-1 x -21258347-11 x -1932577-17 x -1250491-79 x -269093-187 x -113681-869 x -24463-1343 x -15829-1439 x -14773
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 21,258,347, 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 | 21,258,347 | |
| -1 | -21,258,347 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,258,347.
Example:
1 x 21,258,347 = 21,258,347
and
-1 x -21,258,347 = 21,258,347
Notice both answers equal 21,258,347
With that explanation out of the way, let's continue. Next, we take the number 21,258,347 and divide it by 2:
21,258,347 ÷ 2 = 10,629,173.5
If the quotient is a whole number, then 2 and 10,629,173.5 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 | 21,258,347 | |
| -1 | -21,258,347 |
Now, we try dividing 21,258,347 by 3:
21,258,347 ÷ 3 = 7,086,115.6667
If the quotient is a whole number, then 3 and 7,086,115.6667 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 | 21,258,347 | |
| -1 | -21,258,347 |
Let's try dividing by 4:
21,258,347 ÷ 4 = 5,314,586.75
If the quotient is a whole number, then 4 and 5,314,586.75 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 | 21,258,347 | |
| -1 | 21,258,347 |
If you did it right, you will end up with this table:
| 1 | 11 | 17 | 79 | 187 | 869 | 1,343 | 1,439 | 14,773 | 15,829 | 24,463 | 113,681 | 269,093 | 1,250,491 | 1,932,577 | 21,258,347 |
| -1 | -11 | -17 | -79 | -187 | -869 | -1,343 | -1,439 | -14,773 | -15,829 | -24,463 | -113,681 | -269,093 | -1,250,491 | -1,932,577 | -21,258,347 |
Here are some more numbers to try:
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