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In English, the number 2021 is written as "two thousand twenty-one." This is because in English, numbers are typically written using a base-10 system, with each digit representing a multiple of a power of 10. In the case of 2021, the digits represent two thousands, zero hundreds, two tens, and one unit.

The origins of this numbering system can be traced back to ancient civilizations, such as the Babylonians and the Egyptians, who used similar systems to represent numbers.

Here are some examples of how the number 2021 might be used in English sentences:

I was born in the year 2021.
The movie will be released in 2021.
The company has experienced steady growth since its founding in 2021.

In Chinese, the number 2021 is written as "二千零二十一" (èr qiān líng èr shí yī).

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