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sum
A rational number
21 and 20
A 400-digit number is typically referred to as a "400-digit number." In mathematics, numbers are categorized by their number of digits, such as single-digit numbers, double-digit numbers, triple-digit numbers, and so on. Therefore, a number with 400 digits would simply be called a "400-digit number."
21
100 quintillion is a 21 digit number with 20 zeroes.
a Quadrillion is a 16 digit number
You would call it million.
A doublelery
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?
You are missing a digit. Find it.
sum
A rational number
21 and 20
21, for example.
21
There is no specific name: you just call it a number with 2 or more digits or a multi-digit number.