9
12 digits.12 digits.12 digits.12 digits.
Seven digits.
9 digits
There are 2892 digits.
All four of the digits given are significant digits.
141
6 digits
6
12 digits.12 digits.12 digits.12 digits.
A quadrillion has 16 digits.
Seven digits.
6 digits
4
8 digits.
9 digits
5 digits
Five digits.