A:
Positive:
1 x 2104828713 x 161909929 x 72580331 x 678977377 x 55831403 x 52229899 x 234131801 x 11687
Negative:
-1 x -21048287-13 x -1619099-29 x -725803-31 x -678977-377 x -55831-403 x -52229-899 x -23413-1801 x -11687
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 21,048,287, 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 | 21,048,287 | |
| -1 | -21,048,287 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,048,287.
Example:
1 x 21,048,287 = 21,048,287
and
-1 x -21,048,287 = 21,048,287
Notice both answers equal 21,048,287
With that explanation out of the way, let's continue. Next, we take the number 21,048,287 and divide it by 2:
21,048,287 ÷ 2 = 10,524,143.5
If the quotient is a whole number, then 2 and 10,524,143.5 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 | 21,048,287 | |
| -1 | -21,048,287 |
Now, we try dividing 21,048,287 by 3:
21,048,287 ÷ 3 = 7,016,095.6667
If the quotient is a whole number, then 3 and 7,016,095.6667 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 | 21,048,287 | |
| -1 | -21,048,287 |
Let's try dividing by 4:
21,048,287 ÷ 4 = 5,262,071.75
If the quotient is a whole number, then 4 and 5,262,071.75 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 | 21,048,287 | |
| -1 | 21,048,287 |
If you did it right, you will end up with this table:
| 1 | 13 | 29 | 31 | 377 | 403 | 899 | 1,801 | 11,687 | 23,413 | 52,229 | 55,831 | 678,977 | 725,803 | 1,619,099 | 21,048,287 |
| -1 | -13 | -29 | -31 | -377 | -403 | -899 | -1,801 | -11,687 | -23,413 | -52,229 | -55,831 | -678,977 | -725,803 | -1,619,099 | -21,048,287 |
Here are some more numbers to try:
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