211 is a prime number.
211 is the smallest prime such that the sum of its even digits equals the sum of its odd digits.
211 is 111 in base 14.
211 is a centered decagonal number.
211 is the maximum number of regions into which 20 lines divide the plane.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYtM5kgNtNudhy27IIsbx4vDqNtQBkuD0o2XA5V22IDiP9XjujcwwXDO19unI1InmAKaoOlcXiSabPbt94p7UakrjzCW85SIPEC5HHQWctDaaRbE7YJJibfgfvgABvn0H4Z55EA2SeNDw/s200/n0211.jpg)
Source: Number Gossip
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