A:
Positive:
1 x 213964555 x 427929117 x 125861585 x 251723211 x 1014051055 x 202811193 x 179353587 x 5965
Negative:
-1 x -21396455-5 x -4279291-17 x -1258615-85 x -251723-211 x -101405-1055 x -20281-1193 x -17935-3587 x -5965
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 21,396,455, 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 | 21,396,455 | |
| -1 | -21,396,455 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,396,455.
Example:
1 x 21,396,455 = 21,396,455
and
-1 x -21,396,455 = 21,396,455
Notice both answers equal 21,396,455
With that explanation out of the way, let's continue. Next, we take the number 21,396,455 and divide it by 2:
21,396,455 ÷ 2 = 10,698,227.5
If the quotient is a whole number, then 2 and 10,698,227.5 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 | 21,396,455 | |
| -1 | -21,396,455 |
Now, we try dividing 21,396,455 by 3:
21,396,455 ÷ 3 = 7,132,151.6667
If the quotient is a whole number, then 3 and 7,132,151.6667 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 | 21,396,455 | |
| -1 | -21,396,455 |
Let's try dividing by 4:
21,396,455 ÷ 4 = 5,349,113.75
If the quotient is a whole number, then 4 and 5,349,113.75 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 | 21,396,455 | |
| -1 | 21,396,455 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 85 | 211 | 1,055 | 1,193 | 3,587 | 5,965 | 17,935 | 20,281 | 101,405 | 251,723 | 1,258,615 | 4,279,291 | 21,396,455 |
| -1 | -5 | -17 | -85 | -211 | -1,055 | -1,193 | -3,587 | -5,965 | -17,935 | -20,281 | -101,405 | -251,723 | -1,258,615 | -4,279,291 | -21,396,455 |
Here are some more numbers to try:
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