211923 has 16 divisors (see below), whose sum is σ = 322560. Its totient is φ = 137448.

The previous prime is 211891. The next prime is 211927. The reversal of 211923 is 329112.

It is a happy number.

It is not a de Polignac number, because 211923 - 2⁵ = 211891 is a prime.

It is a super-2 number, since 2×211923² = 89822715858, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211896 and 211905.

It is not an unprimeable number, because it can be changed into a prime (211927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1186 + ... + 1352.

It is an arithmetic number, because the mean of its divisors is an integer number (20160).

2²¹¹⁹²³ is an apocalyptic number.

211923 is a deficient number, since it is larger than the sum of its proper divisors (110637).

211923 is a wasteful number, since it uses less digits than its factorization.

211923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 217 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 211923 is about 460.3509530782. The cubic root of 211923 is about 59.6200996724.

The spelling of 211923 in words is "two hundred eleven thousand, nine hundred twenty-three".