Q: What is the negative version of the number 21,515,891?
A: -21,515,891
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:
| 21,515,889 | 21,515,890 | 21,515,892 | 21,515,893 |
| -21,515,889 | -21,515,890 | -21,515,892 | -21,515,893 |