211864 has 16 divisors (see below), whose sum is σ = 403920. Its totient is φ = 104160.

The previous prime is 211859. The next prime is 211867. The reversal of 211864 is 468112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382 + ... + 754.

It is an arithmetic number, because the mean of its divisors is an integer number (25245).

2²¹¹⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

211864 is a deficient number, since it is larger than the sum of its proper divisors (192056).

211864 is a wasteful number, since it uses less digits than its factorization.

211864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450 (or 446 counting only the distinct ones).

The product of its digits is 384, while the sum is 22.

The square root of 211864 is about 460.2868670731. The cubic root of 211864 is about 59.6145663539.

Adding to 211864 its reverse (468112), we get a palindrome (679976).

The spelling of 211864 in words is "two hundred eleven thousand, eight hundred sixty-four".