No, it is a name given to the size of a number.
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2,000,000,000,000,000,000,000,000,000,000,000,000 is two undecillion, or two sextillion in old British notation.
One hundred undecillion.
Oh, what a big number we have here! The word form of 10 followed by 37 zeros is "ten undecillion." Just imagine all the happy little zeros dancing together in harmony, creating such a beautiful number.
After decillion, we have undecillion. After that, we have duodecillion. There are many large to list! See the list of numbers, which include some numbers after decillion at the link:
The power of 1000 that comes after an undecillion is a duodecillion. In US usage, this is equal to 1039, while in archaic UK and Commonwealth usage, this is equal to 1072.