Q: What is the negative version of the number 21,515,009?
A: -21,515,009
Negative numbers are usually written with - in front of them. They represent a number that is less than zero.
Here are more examples of negative numbers in sequence:
| 21,515,007 | 21,515,008 | 21,515,010 | 21,515,011 |
| -21,515,007 | -21,515,008 | -21,515,010 | -21,515,011 |