Q: What is the negative version of the number 215,781,521?
A: -215,781,521
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:
| 215,781,519 | 215,781,520 | 215,781,522 | 215,781,523 |
| -215,781,519 | -215,781,520 | -215,781,522 | -215,781,523 |