A:
Positive:
1 x 213675555 x 427351111 x 194250517 x 125691555 x 38850185 x 251383187 x 114265935 x 22853
Negative:
-1 x -21367555-5 x -4273511-11 x -1942505-17 x -1256915-55 x -388501-85 x -251383-187 x -114265-935 x -22853
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 21,367,555, 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 | 21,367,555 | |
| -1 | -21,367,555 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,367,555.
Example:
1 x 21,367,555 = 21,367,555
and
-1 x -21,367,555 = 21,367,555
Notice both answers equal 21,367,555
With that explanation out of the way, let's continue. Next, we take the number 21,367,555 and divide it by 2:
21,367,555 ÷ 2 = 10,683,777.5
If the quotient is a whole number, then 2 and 10,683,777.5 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 | 21,367,555 | |
| -1 | -21,367,555 |
Now, we try dividing 21,367,555 by 3:
21,367,555 ÷ 3 = 7,122,518.3333
If the quotient is a whole number, then 3 and 7,122,518.3333 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 | 21,367,555 | |
| -1 | -21,367,555 |
Let's try dividing by 4:
21,367,555 ÷ 4 = 5,341,888.75
If the quotient is a whole number, then 4 and 5,341,888.75 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 | 21,367,555 | |
| -1 | 21,367,555 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 17 | 55 | 85 | 187 | 935 | 22,853 | 114,265 | 251,383 | 388,501 | 1,256,915 | 1,942,505 | 4,273,511 | 21,367,555 |
| -1 | -5 | -11 | -17 | -55 | -85 | -187 | -935 | -22,853 | -114,265 | -251,383 | -388,501 | -1,256,915 | -1,942,505 | -4,273,511 | -21,367,555 |
Here are some more numbers to try:
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