A:
Positive:
1 x 2114355111 x 192214113 x 1626427143 x 147857199 x 106249743 x 284572189 x 96592587 x 8173
Negative:
-1 x -21143551-11 x -1922141-13 x -1626427-143 x -147857-199 x -106249-743 x -28457-2189 x -9659-2587 x -8173
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 21,143,551, 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 | 21,143,551 | |
| -1 | -21,143,551 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,143,551.
Example:
1 x 21,143,551 = 21,143,551
and
-1 x -21,143,551 = 21,143,551
Notice both answers equal 21,143,551
With that explanation out of the way, let's continue. Next, we take the number 21,143,551 and divide it by 2:
21,143,551 ÷ 2 = 10,571,775.5
If the quotient is a whole number, then 2 and 10,571,775.5 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 | 21,143,551 | |
| -1 | -21,143,551 |
Now, we try dividing 21,143,551 by 3:
21,143,551 ÷ 3 = 7,047,850.3333
If the quotient is a whole number, then 3 and 7,047,850.3333 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 | 21,143,551 | |
| -1 | -21,143,551 |
Let's try dividing by 4:
21,143,551 ÷ 4 = 5,285,887.75
If the quotient is a whole number, then 4 and 5,285,887.75 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 | 21,143,551 | |
| -1 | 21,143,551 |
If you did it right, you will end up with this table:
| 1 | 11 | 13 | 143 | 199 | 743 | 2,189 | 2,587 | 8,173 | 9,659 | 28,457 | 106,249 | 147,857 | 1,626,427 | 1,922,141 | 21,143,551 |
| -1 | -11 | -13 | -143 | -199 | -743 | -2,189 | -2,587 | -8,173 | -9,659 | -28,457 | -106,249 | -147,857 | -1,626,427 | -1,922,141 | -21,143,551 |
Here are some more numbers to try:
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