Q: What is the negative version of the number 21,688,409?
A: -21,688,409
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:
| 21,688,407 | 21,688,408 | 21,688,410 | 21,688,411 |
| -21,688,407 | -21,688,408 | -21,688,410 | -21,688,411 |