Q: How Many Digits in the Number 400,042,421?

 A: The number 400,042,421 has 9 digits.

How does 400,042,421 have 9 digits?

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


400042421
Digit # 123456789

What are the number of digits of the numbers near 400,042,421?

400,042,419400,042,420400,042,422400,042,423
9999

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