A:
Positive:
1 x 212428097 x 303468717 x 1249577119 x 178511137 x 155057959 x 221511303 x 163032329 x 9121
Negative:
-1 x -21242809-7 x -3034687-17 x -1249577-119 x -178511-137 x -155057-959 x -22151-1303 x -16303-2329 x -9121
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 21,242,809, 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 | 21,242,809 | |
| -1 | -21,242,809 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,242,809.
Example:
1 x 21,242,809 = 21,242,809
and
-1 x -21,242,809 = 21,242,809
Notice both answers equal 21,242,809
With that explanation out of the way, let's continue. Next, we take the number 21,242,809 and divide it by 2:
21,242,809 ÷ 2 = 10,621,404.5
If the quotient is a whole number, then 2 and 10,621,404.5 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 | 21,242,809 | |
| -1 | -21,242,809 |
Now, we try dividing 21,242,809 by 3:
21,242,809 ÷ 3 = 7,080,936.3333
If the quotient is a whole number, then 3 and 7,080,936.3333 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 | 21,242,809 | |
| -1 | -21,242,809 |
Let's try dividing by 4:
21,242,809 ÷ 4 = 5,310,702.25
If the quotient is a whole number, then 4 and 5,310,702.25 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 | 21,242,809 | |
| -1 | 21,242,809 |
If you did it right, you will end up with this table:
| 1 | 7 | 17 | 119 | 137 | 959 | 1,303 | 2,329 | 9,121 | 16,303 | 22,151 | 155,057 | 178,511 | 1,249,577 | 3,034,687 | 21,242,809 |
| -1 | -7 | -17 | -119 | -137 | -959 | -1,303 | -2,329 | -9,121 | -16,303 | -22,151 | -155,057 | -178,511 | -1,249,577 | -3,034,687 | -21,242,809 |
Here are some more numbers to try:
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