A:
Positive:
1 x 214021997 x 305745713 x 164632391 x 235189479 x 44681491 x 435893353 x 63833437 x 6227
Negative:
-1 x -21402199-7 x -3057457-13 x -1646323-91 x -235189-479 x -44681-491 x -43589-3353 x -6383-3437 x -6227
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 21,402,199, 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 | 21,402,199 | |
| -1 | -21,402,199 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,402,199.
Example:
1 x 21,402,199 = 21,402,199
and
-1 x -21,402,199 = 21,402,199
Notice both answers equal 21,402,199
With that explanation out of the way, let's continue. Next, we take the number 21,402,199 and divide it by 2:
21,402,199 ÷ 2 = 10,701,099.5
If the quotient is a whole number, then 2 and 10,701,099.5 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 | 21,402,199 | |
| -1 | -21,402,199 |
Now, we try dividing 21,402,199 by 3:
21,402,199 ÷ 3 = 7,134,066.3333
If the quotient is a whole number, then 3 and 7,134,066.3333 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 | 21,402,199 | |
| -1 | -21,402,199 |
Let's try dividing by 4:
21,402,199 ÷ 4 = 5,350,549.75
If the quotient is a whole number, then 4 and 5,350,549.75 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 | 21,402,199 | |
| -1 | 21,402,199 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 91 | 479 | 491 | 3,353 | 3,437 | 6,227 | 6,383 | 43,589 | 44,681 | 235,189 | 1,646,323 | 3,057,457 | 21,402,199 |
| -1 | -7 | -13 | -91 | -479 | -491 | -3,353 | -3,437 | -6,227 | -6,383 | -43,589 | -44,681 | -235,189 | -1,646,323 | -3,057,457 | -21,402,199 |
Here are some more numbers to try:
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