211813965 has 48 divisors (see below), whose sum is σ = 424097856. Its totient is φ = 96652800.

The previous prime is 211813961. The next prime is 211813991. The reversal of 211813965 is 569318112.

It is not a de Polignac number, because 211813965 - 2² = 211813961 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211813961) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4171 + ... + 21000.

It is an arithmetic number, because the mean of its divisors is an integer number (8835372).

Almost surely, 2^211813965 is an apocalyptic number.

It is an amenable number.

211813965 is an abundant number, since it is smaller than the sum of its proper divisors (212283891).

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

211813965 is a wasteful number, since it uses less digits than its factorization.

211813965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25210 (or 25207 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 211813965 is about 14553.8299083094. The cubic root of 211813965 is about 596.0987301344.

The spelling of 211813965 in words is "two hundred eleven million, eight hundred thirteen thousand, nine hundred sixty-five".