A:
Positive:
1 x 2140993331 x 69064353 x 40396183 x 257951157 x 1363691643 x 130312573 x 83214399 x 4867
Negative:
-1 x -21409933-31 x -690643-53 x -403961-83 x -257951-157 x -136369-1643 x -13031-2573 x -8321-4399 x -4867
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 21,409,933, 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 | 21,409,933 | |
| -1 | -21,409,933 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,409,933.
Example:
1 x 21,409,933 = 21,409,933
and
-1 x -21,409,933 = 21,409,933
Notice both answers equal 21,409,933
With that explanation out of the way, let's continue. Next, we take the number 21,409,933 and divide it by 2:
21,409,933 ÷ 2 = 10,704,966.5
If the quotient is a whole number, then 2 and 10,704,966.5 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 | 21,409,933 | |
| -1 | -21,409,933 |
Now, we try dividing 21,409,933 by 3:
21,409,933 ÷ 3 = 7,136,644.3333
If the quotient is a whole number, then 3 and 7,136,644.3333 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 | 21,409,933 | |
| -1 | -21,409,933 |
Let's try dividing by 4:
21,409,933 ÷ 4 = 5,352,483.25
If the quotient is a whole number, then 4 and 5,352,483.25 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 | 21,409,933 | |
| -1 | 21,409,933 |
If you did it right, you will end up with this table:
| 1 | 31 | 53 | 83 | 157 | 1,643 | 2,573 | 4,399 | 4,867 | 8,321 | 13,031 | 136,369 | 257,951 | 403,961 | 690,643 | 21,409,933 |
| -1 | -31 | -53 | -83 | -157 | -1,643 | -2,573 | -4,399 | -4,867 | -8,321 | -13,031 | -136,369 | -257,951 | -403,961 | -690,643 | -21,409,933 |
Here are some more numbers to try:
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