A:
Positive:
1 x 2165362111 x 196851137 x 58523383 x 260887407 x 53203641 x 33781913 x 237173071 x 7051
Negative:
-1 x -21653621-11 x -1968511-37 x -585233-83 x -260887-407 x -53203-641 x -33781-913 x -23717-3071 x -7051
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 21,653,621, 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 | 21,653,621 | |
| -1 | -21,653,621 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,653,621.
Example:
1 x 21,653,621 = 21,653,621
and
-1 x -21,653,621 = 21,653,621
Notice both answers equal 21,653,621
With that explanation out of the way, let's continue. Next, we take the number 21,653,621 and divide it by 2:
21,653,621 ÷ 2 = 10,826,810.5
If the quotient is a whole number, then 2 and 10,826,810.5 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 | 21,653,621 | |
| -1 | -21,653,621 |
Now, we try dividing 21,653,621 by 3:
21,653,621 ÷ 3 = 7,217,873.6667
If the quotient is a whole number, then 3 and 7,217,873.6667 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 | 21,653,621 | |
| -1 | -21,653,621 |
Let's try dividing by 4:
21,653,621 ÷ 4 = 5,413,405.25
If the quotient is a whole number, then 4 and 5,413,405.25 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 | 21,653,621 | |
| -1 | 21,653,621 |
If you did it right, you will end up with this table:
| 1 | 11 | 37 | 83 | 407 | 641 | 913 | 3,071 | 7,051 | 23,717 | 33,781 | 53,203 | 260,887 | 585,233 | 1,968,511 | 21,653,621 |
| -1 | -11 | -37 | -83 | -407 | -641 | -913 | -3,071 | -7,051 | -23,717 | -33,781 | -53,203 | -260,887 | -585,233 | -1,968,511 | -21,653,621 |
Here are some more numbers to try:
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