A:
Positive:
1 x 210547555 x 421095117 x 123851519 x 110814585 x 24770395 x 221629323 x 651851615 x 13037
Negative:
-1 x -21054755-5 x -4210951-17 x -1238515-19 x -1108145-85 x -247703-95 x -221629-323 x -65185-1615 x -13037
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 21,054,755, 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 | 21,054,755 | |
| -1 | -21,054,755 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,054,755.
Example:
1 x 21,054,755 = 21,054,755
and
-1 x -21,054,755 = 21,054,755
Notice both answers equal 21,054,755
With that explanation out of the way, let's continue. Next, we take the number 21,054,755 and divide it by 2:
21,054,755 ÷ 2 = 10,527,377.5
If the quotient is a whole number, then 2 and 10,527,377.5 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 | 21,054,755 | |
| -1 | -21,054,755 |
Now, we try dividing 21,054,755 by 3:
21,054,755 ÷ 3 = 7,018,251.6667
If the quotient is a whole number, then 3 and 7,018,251.6667 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 | 21,054,755 | |
| -1 | -21,054,755 |
Let's try dividing by 4:
21,054,755 ÷ 4 = 5,263,688.75
If the quotient is a whole number, then 4 and 5,263,688.75 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 | 21,054,755 | |
| -1 | 21,054,755 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 19 | 85 | 95 | 323 | 1,615 | 13,037 | 65,185 | 221,629 | 247,703 | 1,108,145 | 1,238,515 | 4,210,951 | 21,054,755 |
| -1 | -5 | -17 | -19 | -85 | -95 | -323 | -1,615 | -13,037 | -65,185 | -221,629 | -247,703 | -1,108,145 | -1,238,515 | -4,210,951 | -21,054,755 |
Here are some more numbers to try:
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