A:
Positive:
1 x 210025255 x 420050525 x 84010129 x 72422559 x 355975145 x 144845295 x 71195491 x 42775725 x 289691475 x 142391711 x 122752455 x 8555
Negative:
-1 x -21002525-5 x -4200505-25 x -840101-29 x -724225-59 x -355975-145 x -144845-295 x -71195-491 x -42775-725 x -28969-1475 x -14239-1711 x -12275-2455 x -8555
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 21,002,525, 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 | 21,002,525 | |
| -1 | -21,002,525 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,002,525.
Example:
1 x 21,002,525 = 21,002,525
and
-1 x -21,002,525 = 21,002,525
Notice both answers equal 21,002,525
With that explanation out of the way, let's continue. Next, we take the number 21,002,525 and divide it by 2:
21,002,525 ÷ 2 = 10,501,262.5
If the quotient is a whole number, then 2 and 10,501,262.5 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 | 21,002,525 | |
| -1 | -21,002,525 |
Now, we try dividing 21,002,525 by 3:
21,002,525 ÷ 3 = 7,000,841.6667
If the quotient is a whole number, then 3 and 7,000,841.6667 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 | 21,002,525 | |
| -1 | -21,002,525 |
Let's try dividing by 4:
21,002,525 ÷ 4 = 5,250,631.25
If the quotient is a whole number, then 4 and 5,250,631.25 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 | 21,002,525 | |
| -1 | 21,002,525 |
If you did it right, you will end up with this table:
| 1 | 5 | 25 | 29 | 59 | 145 | 295 | 491 | 725 | 1,475 | 1,711 | 2,455 | 8,555 | 12,275 | 14,239 | 28,969 | 42,775 | 71,195 | 144,845 | 355,975 | 724,225 | 840,101 | 4,200,505 | 21,002,525 |
| -1 | -5 | -25 | -29 | -59 | -145 | -295 | -491 | -725 | -1,475 | -1,711 | -2,455 | -8,555 | -12,275 | -14,239 | -28,969 | -42,775 | -71,195 | -144,845 | -355,975 | -724,225 | -840,101 | -4,200,505 | -21,002,525 |
Here are some more numbers to try:
Try the factor calculator