420 422

The Number 421: Properties and Meanings

421 is a Prime Number.

421 is a Centered Square Number.

421 is a Centered 15-gonal Number.

421 is a Centered 20-gonal Number.

421 is a Centered 28-gonal Number.

421 is a Centered 42-gonal Number.


The Year 421 AD

In the year 421 AD ...

420 422

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