The number with 21 zeros behind it is 10,000,000,000,000,000,000,000, which is also written as 10^21 in scientific notation. This number is obtained by multiplying 10 by itself 21 times. In mathematics, this number is referred to as a "sextillion."
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The number 4,720,000,000,000,000,000,000 can be said as "four sextillion seven hundred twenty quintillion." In scientific notation, this number can be written as 4.72 x 10^21. The prefix "sextillion" indicates a number followed by 21 zeros, while "quintillion" indicates a number followed by 18 zeros.
any number containing 100 zeros has 100 zeros but i'm assuming you mean a 1 fallowed by 100 consecutive zeros; that is a Googol or 10,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000,­000
in my agenda at school, there is a little fact that the number centrillion, has 500 zeros. but, there is probaby a higher number out there. a googol is 1 followed by 100 zeros, but higher named number is a googolplex which is one followed by googol number of zeros - that's a lot of zeros!
the number googol has exactly 100 zeros in it
A one to three digit number followed by six zeros is millions