A:
Positive:
1 x 212277317 x 303253319 x 111724949 x 433219133 x 159607151 x 140581931 x 228011057 x 200832869 x 7399
Negative:
-1 x -21227731-7 x -3032533-19 x -1117249-49 x -433219-133 x -159607-151 x -140581-931 x -22801-1057 x -20083-2869 x -7399
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 21,227,731, 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 | 21,227,731 | |
| -1 | -21,227,731 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,227,731.
Example:
1 x 21,227,731 = 21,227,731
and
-1 x -21,227,731 = 21,227,731
Notice both answers equal 21,227,731
With that explanation out of the way, let's continue. Next, we take the number 21,227,731 and divide it by 2:
21,227,731 ÷ 2 = 10,613,865.5
If the quotient is a whole number, then 2 and 10,613,865.5 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 | 21,227,731 | |
| -1 | -21,227,731 |
Now, we try dividing 21,227,731 by 3:
21,227,731 ÷ 3 = 7,075,910.3333
If the quotient is a whole number, then 3 and 7,075,910.3333 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 | 21,227,731 | |
| -1 | -21,227,731 |
Let's try dividing by 4:
21,227,731 ÷ 4 = 5,306,932.75
If the quotient is a whole number, then 4 and 5,306,932.75 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 | 21,227,731 | |
| -1 | 21,227,731 |
If you did it right, you will end up with this table:
| 1 | 7 | 19 | 49 | 133 | 151 | 931 | 1,057 | 2,869 | 7,399 | 20,083 | 22,801 | 140,581 | 159,607 | 433,219 | 1,117,249 | 3,032,533 | 21,227,731 |
| -1 | -7 | -19 | -49 | -133 | -151 | -931 | -1,057 | -2,869 | -7,399 | -20,083 | -22,801 | -140,581 | -159,607 | -433,219 | -1,117,249 | -3,032,533 | -21,227,731 |
Here are some more numbers to try:
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