A:
Positive:
1 x 211402555 x 422805119 x 111264595 x 222529193 x 109535965 x 219071153 x 183353667 x 5765
Negative:
-1 x -21140255-5 x -4228051-19 x -1112645-95 x -222529-193 x -109535-965 x -21907-1153 x -18335-3667 x -5765
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 21,140,255, 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 | 21,140,255 | |
| -1 | -21,140,255 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,140,255.
Example:
1 x 21,140,255 = 21,140,255
and
-1 x -21,140,255 = 21,140,255
Notice both answers equal 21,140,255
With that explanation out of the way, let's continue. Next, we take the number 21,140,255 and divide it by 2:
21,140,255 ÷ 2 = 10,570,127.5
If the quotient is a whole number, then 2 and 10,570,127.5 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 | 21,140,255 | |
| -1 | -21,140,255 |
Now, we try dividing 21,140,255 by 3:
21,140,255 ÷ 3 = 7,046,751.6667
If the quotient is a whole number, then 3 and 7,046,751.6667 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 | 21,140,255 | |
| -1 | -21,140,255 |
Let's try dividing by 4:
21,140,255 ÷ 4 = 5,285,063.75
If the quotient is a whole number, then 4 and 5,285,063.75 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 | 21,140,255 | |
| -1 | 21,140,255 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 95 | 193 | 965 | 1,153 | 3,667 | 5,765 | 18,335 | 21,907 | 109,535 | 222,529 | 1,112,645 | 4,228,051 | 21,140,255 |
| -1 | -5 | -19 | -95 | -193 | -965 | -1,153 | -3,667 | -5,765 | -18,335 | -21,907 | -109,535 | -222,529 | -1,112,645 | -4,228,051 | -21,140,255 |
Here are some more numbers to try:
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