211993212 has 12 divisors (see below), whose sum is σ = 494650856. Its totient is φ = 70664400.

The previous prime is 211993211. The next prime is 211993217. The reversal of 211993212 is 212399112.

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

It is a super-2 number, since 2×211993212² = 89882243868153888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211993212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211993211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8833039 + ... + 8833062.

Almost surely, 2^211993212 is an apocalyptic number.

It is an amenable number.

211993212 is an abundant number, since it is smaller than the sum of its proper divisors (282657644).

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

211993212 is a wasteful number, since it uses less digits than its factorization.

211993212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17666108 (or 17666106 counting only the distinct ones).

The product of its digits is 1944, while the sum is 30.

The square root of 211993212 is about 14559.9866758181. The cubic root of 211993212 is about 596.2668317089.

The spelling of 211993212 in words is "two hundred eleven million, nine hundred ninety-three thousand, two hundred twelve".