A:
Positive:
1 x 219674217 x 3138203107 x 205303139 x 158039211 x 104111749 x 29329973 x 225771477 x 14873
Negative:
-1 x -21967421-7 x -3138203-107 x -205303-139 x -158039-211 x -104111-749 x -29329-973 x -22577-1477 x -14873
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 21,967,421, 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 | 21,967,421 | |
| -1 | -21,967,421 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,967,421.
Example:
1 x 21,967,421 = 21,967,421
and
-1 x -21,967,421 = 21,967,421
Notice both answers equal 21,967,421
With that explanation out of the way, let's continue. Next, we take the number 21,967,421 and divide it by 2:
21,967,421 ÷ 2 = 10,983,710.5
If the quotient is a whole number, then 2 and 10,983,710.5 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 | 21,967,421 | |
| -1 | -21,967,421 |
Now, we try dividing 21,967,421 by 3:
21,967,421 ÷ 3 = 7,322,473.6667
If the quotient is a whole number, then 3 and 7,322,473.6667 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 | 21,967,421 | |
| -1 | -21,967,421 |
Let's try dividing by 4:
21,967,421 ÷ 4 = 5,491,855.25
If the quotient is a whole number, then 4 and 5,491,855.25 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 | 21,967,421 | |
| -1 | 21,967,421 |
If you did it right, you will end up with this table:
| 1 | 7 | 107 | 139 | 211 | 749 | 973 | 1,477 | 14,873 | 22,577 | 29,329 | 104,111 | 158,039 | 205,303 | 3,138,203 | 21,967,421 |
| -1 | -7 | -107 | -139 | -211 | -749 | -973 | -1,477 | -14,873 | -22,577 | -29,329 | -104,111 | -158,039 | -205,303 | -3,138,203 | -21,967,421 |
Here are some more numbers to try:
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