211331668 has 24 divisors (see below), whose sum is σ = 376279904. Its totient is φ = 103831200.

The previous prime is 211331663. The next prime is 211331677. The reversal of 211331668 is 866133112.

It is a super-2 number, since 2×211331668² = 89322147799324448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211331663) 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, 152338 + ... + 153718.

Almost surely, 2^211331668 is an apocalyptic number.

It is an amenable number.

211331668 is a deficient number, since it is larger than the sum of its proper divisors (164948236).

211331668 is a wasteful number, since it uses less digits than its factorization.

211331668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023 (or 2021 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 211331668 is about 14537.2510468795. The cubic root of 211331668 is about 595.6459505548.

It can be divided in two parts, 21133 and 1668, that added together give a square (22801 = 151²).

The spelling of 211331668 in words is "two hundred eleven million, three hundred thirty-one thousand, six hundred sixty-eight".