A:
Positive:
1 x 2105431911 x 191402913 x 161956329 x 726011143 x 147233319 x 66001377 x 558474147 x 5077
Negative:
-1 x -21054319-11 x -1914029-13 x -1619563-29 x -726011-143 x -147233-319 x -66001-377 x -55847-4147 x -5077
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 21,054,319, 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 | 21,054,319 | |
| -1 | -21,054,319 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,054,319.
Example:
1 x 21,054,319 = 21,054,319
and
-1 x -21,054,319 = 21,054,319
Notice both answers equal 21,054,319
With that explanation out of the way, let's continue. Next, we take the number 21,054,319 and divide it by 2:
21,054,319 ÷ 2 = 10,527,159.5
If the quotient is a whole number, then 2 and 10,527,159.5 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 | 21,054,319 | |
| -1 | -21,054,319 |
Now, we try dividing 21,054,319 by 3:
21,054,319 ÷ 3 = 7,018,106.3333
If the quotient is a whole number, then 3 and 7,018,106.3333 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 | 21,054,319 | |
| -1 | -21,054,319 |
Let's try dividing by 4:
21,054,319 ÷ 4 = 5,263,579.75
If the quotient is a whole number, then 4 and 5,263,579.75 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 | 21,054,319 | |
| -1 | 21,054,319 |
If you did it right, you will end up with this table:
| 1 | 11 | 13 | 29 | 143 | 319 | 377 | 4,147 | 5,077 | 55,847 | 66,001 | 147,233 | 726,011 | 1,619,563 | 1,914,029 | 21,054,319 |
| -1 | -11 | -13 | -29 | -143 | -319 | -377 | -4,147 | -5,077 | -55,847 | -66,001 | -147,233 | -726,011 | -1,619,563 | -1,914,029 | -21,054,319 |
Here are some more numbers to try:
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