A:
Positive:
1 x 2137672911 x 194333919 x 112509123 x 929423209 x 102281253 x 84493437 x 489174447 x 4807
Negative:
-1 x -21376729-11 x -1943339-19 x -1125091-23 x -929423-209 x -102281-253 x -84493-437 x -48917-4447 x -4807
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 21,376,729, 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 | 21,376,729 | |
| -1 | -21,376,729 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,376,729.
Example:
1 x 21,376,729 = 21,376,729
and
-1 x -21,376,729 = 21,376,729
Notice both answers equal 21,376,729
With that explanation out of the way, let's continue. Next, we take the number 21,376,729 and divide it by 2:
21,376,729 ÷ 2 = 10,688,364.5
If the quotient is a whole number, then 2 and 10,688,364.5 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 | 21,376,729 | |
| -1 | -21,376,729 |
Now, we try dividing 21,376,729 by 3:
21,376,729 ÷ 3 = 7,125,576.3333
If the quotient is a whole number, then 3 and 7,125,576.3333 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 | 21,376,729 | |
| -1 | -21,376,729 |
Let's try dividing by 4:
21,376,729 ÷ 4 = 5,344,182.25
If the quotient is a whole number, then 4 and 5,344,182.25 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 | 21,376,729 | |
| -1 | 21,376,729 |
If you did it right, you will end up with this table:
| 1 | 11 | 19 | 23 | 209 | 253 | 437 | 4,447 | 4,807 | 48,917 | 84,493 | 102,281 | 929,423 | 1,125,091 | 1,943,339 | 21,376,729 |
| -1 | -11 | -19 | -23 | -209 | -253 | -437 | -4,447 | -4,807 | -48,917 | -84,493 | -102,281 | -929,423 | -1,125,091 | -1,943,339 | -21,376,729 |
Here are some more numbers to try:
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