A:
Positive:
1 x 210213255 x 420426513 x 161702525 x 84085365 x 32340571 x 296075325 x 64681355 x 59215911 x 23075923 x 227751775 x 118434555 x 4615
Negative:
-1 x -21021325-5 x -4204265-13 x -1617025-25 x -840853-65 x -323405-71 x -296075-325 x -64681-355 x -59215-911 x -23075-923 x -22775-1775 x -11843-4555 x -4615
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 21,021,325, 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 | 21,021,325 | |
| -1 | -21,021,325 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,021,325.
Example:
1 x 21,021,325 = 21,021,325
and
-1 x -21,021,325 = 21,021,325
Notice both answers equal 21,021,325
With that explanation out of the way, let's continue. Next, we take the number 21,021,325 and divide it by 2:
21,021,325 ÷ 2 = 10,510,662.5
If the quotient is a whole number, then 2 and 10,510,662.5 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 | 21,021,325 | |
| -1 | -21,021,325 |
Now, we try dividing 21,021,325 by 3:
21,021,325 ÷ 3 = 7,007,108.3333
If the quotient is a whole number, then 3 and 7,007,108.3333 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 | 21,021,325 | |
| -1 | -21,021,325 |
Let's try dividing by 4:
21,021,325 ÷ 4 = 5,255,331.25
If the quotient is a whole number, then 4 and 5,255,331.25 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 | 21,021,325 | |
| -1 | 21,021,325 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 25 | 65 | 71 | 325 | 355 | 911 | 923 | 1,775 | 4,555 | 4,615 | 11,843 | 22,775 | 23,075 | 59,215 | 64,681 | 296,075 | 323,405 | 840,853 | 1,617,025 | 4,204,265 | 21,021,325 |
| -1 | -5 | -13 | -25 | -65 | -71 | -325 | -355 | -911 | -923 | -1,775 | -4,555 | -4,615 | -11,843 | -22,775 | -23,075 | -59,215 | -64,681 | -296,075 | -323,405 | -840,853 | -1,617,025 | -4,204,265 | -21,021,325 |
Here are some more numbers to try:
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