A:
Positive:
1 x 212001237 x 302858961 x 347543131 x 161833379 x 55937427 x 49649917 x 231192653 x 7991
Negative:
-1 x -21200123-7 x -3028589-61 x -347543-131 x -161833-379 x -55937-427 x -49649-917 x -23119-2653 x -7991
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 21,200,123, 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 | 21,200,123 | |
| -1 | -21,200,123 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,200,123.
Example:
1 x 21,200,123 = 21,200,123
and
-1 x -21,200,123 = 21,200,123
Notice both answers equal 21,200,123
With that explanation out of the way, let's continue. Next, we take the number 21,200,123 and divide it by 2:
21,200,123 ÷ 2 = 10,600,061.5
If the quotient is a whole number, then 2 and 10,600,061.5 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 | 21,200,123 | |
| -1 | -21,200,123 |
Now, we try dividing 21,200,123 by 3:
21,200,123 ÷ 3 = 7,066,707.6667
If the quotient is a whole number, then 3 and 7,066,707.6667 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 | 21,200,123 | |
| -1 | -21,200,123 |
Let's try dividing by 4:
21,200,123 ÷ 4 = 5,300,030.75
If the quotient is a whole number, then 4 and 5,300,030.75 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 | 21,200,123 | |
| -1 | 21,200,123 |
If you did it right, you will end up with this table:
| 1 | 7 | 61 | 131 | 379 | 427 | 917 | 2,653 | 7,991 | 23,119 | 49,649 | 55,937 | 161,833 | 347,543 | 3,028,589 | 21,200,123 |
| -1 | -7 | -61 | -131 | -379 | -427 | -917 | -2,653 | -7,991 | -23,119 | -49,649 | -55,937 | -161,833 | -347,543 | -3,028,589 | -21,200,123 |
Here are some more numbers to try:
Try the factor calculator