1920 1922

The Number 1921: Properties and Meanings

Prime Factors of 1921=17x113.

1921 is a 16-gonal Number.

1921 is a Centered 16-gonal Number.


The Year 1921 AD

In the year 1921 AD John Larson invented the lie detector.

In the year 1921 AD the first robot was built.

1920 1922

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