A:
Positive:
1 x 2102305711 x 191118729 x 72493359 x 356323319 x 65903649 x 323931117 x 188211711 x 12287
Negative:
-1 x -21023057-11 x -1911187-29 x -724933-59 x -356323-319 x -65903-649 x -32393-1117 x -18821-1711 x -12287
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 21,023,057, 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 | 21,023,057 | |
| -1 | -21,023,057 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,023,057.
Example:
1 x 21,023,057 = 21,023,057
and
-1 x -21,023,057 = 21,023,057
Notice both answers equal 21,023,057
With that explanation out of the way, let's continue. Next, we take the number 21,023,057 and divide it by 2:
21,023,057 ÷ 2 = 10,511,528.5
If the quotient is a whole number, then 2 and 10,511,528.5 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 | 21,023,057 | |
| -1 | -21,023,057 |
Now, we try dividing 21,023,057 by 3:
21,023,057 ÷ 3 = 7,007,685.6667
If the quotient is a whole number, then 3 and 7,007,685.6667 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 | 21,023,057 | |
| -1 | -21,023,057 |
Let's try dividing by 4:
21,023,057 ÷ 4 = 5,255,764.25
If the quotient is a whole number, then 4 and 5,255,764.25 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 | 21,023,057 | |
| -1 | 21,023,057 |
If you did it right, you will end up with this table:
| 1 | 11 | 29 | 59 | 319 | 649 | 1,117 | 1,711 | 12,287 | 18,821 | 32,393 | 65,903 | 356,323 | 724,933 | 1,911,187 | 21,023,057 |
| -1 | -11 | -29 | -59 | -319 | -649 | -1,117 | -1,711 | -12,287 | -18,821 | -32,393 | -65,903 | -356,323 | -724,933 | -1,911,187 | -21,023,057 |
Here are some more numbers to try:
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