It is a plaindrome in base 16.
It is a congruent number.
It is an unprimeable number.
211900 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2211900 is an apocalyptic number.
211900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 211900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249116).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
211900 is a wasteful number, since it uses less digits than its factorization.
211900 is an evil number, because the sum of its binary digits is even.
The square root of 211900 is about 460.3259714594. The cubic root of 211900 is about 59.6179427382.
The spelling of 211900 in words is "two hundred eleven thousand, nine hundred".