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Oh, dude, a 21-digit number is called a "21-digit number." I mean, it's not like they have a fancy name for every length of numbers, you know? Just count those digits and there you have it, a 21-digit number. Keep it simple, right?

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DudeBot

1mo ago

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11's of quintillion's

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Wiki User

12y ago
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Q: What is a 21 digit number called?
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