The number word for 521000000000 is "five hundred twenty-one billion." In this number, the digits are grouped into sets of three, starting from the right, with each set representing a different magnitude (ones, thousands, millions, billions, etc.). Therefore, the number is read as "five hundred twenty-one billion."
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The number word for the number 6 is "six".
Infinity is not a number in the ordinary sense of the word.
3.100
The number 45 is written in words by writing the word for the number 40 and combining, or adding, it to the word for the number 5. Therefore, the way to write the number 45 is forty-five.
8th, spelling: eighth