Q: How Many Digits in the Number 815,721,142?

 A: The number 815,721,142 has 9 digits.

How does 815,721,142 have 9 digits?

You simply count the number of digits from the first number to the last. Like this:


815721142
Digit # 123456789

What are the number of digits of the numbers near 815,721,142?

815,721,140815,721,141815,721,143815,721,144
9999

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