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A number with 17 zeros is called a "hundred quadrillion." In numerical form, it is represented as 100,000,000,000,000,000. This term is part of the short scale numbering system commonly used in the United States and modern English-speaking countries.
Trillion
nonevsextillionocteillion
2*1020 this is called 200quintillion a quintillion is a number with 18 zeros a sextillion is a number with 21 zeros your number has 20 zeros therefore it is not quite a sextillion yet.
The number with 18 zeros is called a quintillion in the short scale, which is written as 1 followed by 18 zeros: 1,000,000,000,000,000,000. In scientific notation, it can be expressed as (10^{18}).