Question

what is the least 10 digit whole number

Answer 1

The lowest such number has as small digits as possible.  As the first digit cannot be a 0, it must be a 1.  The rest of the digits can be 0s, so to keep the number as small as possible, we use nine zeroes, for a total number of 1000000000.

Answer 2

1,000,000,000 (ONE TRILLION) HOPE THIS HELPS!!!!!!!!