211668 has 24 divisors (see below), whose sum is σ = 510720. Its totient is φ = 68160.

The previous prime is 211663. The next prime is 211681. The reversal of 211668 is 866112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88 + ... + 656.

It is an arithmetic number, because the mean of its divisors is an integer number (21280).

2²¹¹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

211668 is an abundant number, since it is smaller than the sum of its proper divisors (299052).

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

211668 is a wasteful number, since it uses less digits than its factorization.

211668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607 (or 605 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 211668 is about 460.0739071062. The cubic root of 211668 is about 59.5961771042.

The spelling of 211668 in words is "two hundred eleven thousand, six hundred sixty-eight".