A:
Positive:
1 x 213055555 x 426111119 x 112134595 x 224269137 x 155515685 x 311031637 x 130152603 x 8185
Negative:
-1 x -21305555-5 x -4261111-19 x -1121345-95 x -224269-137 x -155515-685 x -31103-1637 x -13015-2603 x -8185
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 21,305,555, 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 | 21,305,555 | |
| -1 | -21,305,555 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,305,555.
Example:
1 x 21,305,555 = 21,305,555
and
-1 x -21,305,555 = 21,305,555
Notice both answers equal 21,305,555
With that explanation out of the way, let's continue. Next, we take the number 21,305,555 and divide it by 2:
21,305,555 ÷ 2 = 10,652,777.5
If the quotient is a whole number, then 2 and 10,652,777.5 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 | 21,305,555 | |
| -1 | -21,305,555 |
Now, we try dividing 21,305,555 by 3:
21,305,555 ÷ 3 = 7,101,851.6667
If the quotient is a whole number, then 3 and 7,101,851.6667 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 | 21,305,555 | |
| -1 | -21,305,555 |
Let's try dividing by 4:
21,305,555 ÷ 4 = 5,326,388.75
If the quotient is a whole number, then 4 and 5,326,388.75 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 | 21,305,555 | |
| -1 | 21,305,555 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 95 | 137 | 685 | 1,637 | 2,603 | 8,185 | 13,015 | 31,103 | 155,515 | 224,269 | 1,121,345 | 4,261,111 | 21,305,555 |
| -1 | -5 | -19 | -95 | -137 | -685 | -1,637 | -2,603 | -8,185 | -13,015 | -31,103 | -155,515 | -224,269 | -1,121,345 | -4,261,111 | -21,305,555 |
Here are some more numbers to try:
Try the factor calculator