211936668 has 12 divisors (see below), whose sum is σ = 494518920. Its totient is φ = 70645552.

The previous prime is 211936661. The next prime is 211936691. The reversal of 211936668 is 866639112.

211936668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211936661) 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, 8830683 + ... + 8830706.

It is an arithmetic number, because the mean of its divisors is an integer number (41209910).

Almost surely, 2^211936668 is an apocalyptic number.

It is an amenable number.

211936668 is an abundant number, since it is smaller than the sum of its proper divisors (282582252).

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

211936668 is a wasteful number, since it uses less digits than its factorization.

211936668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17661396 (or 17661394 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 211936668 is about 14558.0447863029. The cubic root of 211936668 is about 596.2138138010.

The spelling of 211936668 in words is "two hundred eleven million, nine hundred thirty-six thousand, six hundred sixty-eight".