211908 has 12 divisors (see below), whose sum is σ = 494480. Its totient is φ = 70632.

The previous prime is 211891. The next prime is 211927. The reversal of 211908 is 809112.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

211908 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8818 + ... + 8841.

2²¹¹⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

211908 is an abundant number, since it is smaller than the sum of its proper divisors (282572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211908 is a wasteful number, since it uses less digits than its factorization.

211908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17666 (or 17664 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 211908 is about 460.3346608718. The cubic root of 211908 is about 59.6186929939.

The spelling of 211908 in words is "two hundred eleven thousand, nine hundred eight".