A:
Positive:
1 x 215514537 x 307877911 x 195922319 x 113428777 x 279889133 x 162041209 x 1031171463 x 14731
Negative:
-1 x -21551453-7 x -3078779-11 x -1959223-19 x -1134287-77 x -279889-133 x -162041-209 x -103117-1463 x -14731
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 21,551,453, 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 | 21,551,453 | |
| -1 | -21,551,453 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,551,453.
Example:
1 x 21,551,453 = 21,551,453
and
-1 x -21,551,453 = 21,551,453
Notice both answers equal 21,551,453
With that explanation out of the way, let's continue. Next, we take the number 21,551,453 and divide it by 2:
21,551,453 ÷ 2 = 10,775,726.5
If the quotient is a whole number, then 2 and 10,775,726.5 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 | 21,551,453 | |
| -1 | -21,551,453 |
Now, we try dividing 21,551,453 by 3:
21,551,453 ÷ 3 = 7,183,817.6667
If the quotient is a whole number, then 3 and 7,183,817.6667 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 | 21,551,453 | |
| -1 | -21,551,453 |
Let's try dividing by 4:
21,551,453 ÷ 4 = 5,387,863.25
If the quotient is a whole number, then 4 and 5,387,863.25 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 | 21,551,453 | |
| -1 | 21,551,453 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 19 | 77 | 133 | 209 | 1,463 | 14,731 | 103,117 | 162,041 | 279,889 | 1,134,287 | 1,959,223 | 3,078,779 | 21,551,453 |
| -1 | -7 | -11 | -19 | -77 | -133 | -209 | -1,463 | -14,731 | -103,117 | -162,041 | -279,889 | -1,134,287 | -1,959,223 | -3,078,779 | -21,551,453 |
Here are some more numbers to try:
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