211995 has 24 divisors (see below), whose sum is σ = 420576. Its totient is φ = 96768.

The previous prime is 211979. The next prime is 211997. The reversal of 211995 is 599112.

It is a happy number.

It is not a de Polignac number, because 211995 - 2⁴ = 211979 is a prime.

211995 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (211997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22 + ... + 651.

It is an arithmetic number, because the mean of its divisors is an integer number (17524).

2²¹¹⁹⁹⁵ is an apocalyptic number.

211995 is a deficient number, since it is larger than the sum of its proper divisors (208581).

211995 is a wasteful number, since it uses less digits than its factorization.

211995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691 (or 688 counting only the distinct ones).

The product of its digits is 810, while the sum is 27.

The square root of 211995 is about 460.4291476438. The cubic root of 211995 is about 59.6268508055.

It can be divided in two parts, 21 and 1995, that added together give a triangular number (2016 = T₆₃).

The spelling of 211995 in words is "two hundred eleven thousand, nine hundred ninety-five".