212189166 has 32 divisors (see below), whose sum is σ = 538894080. Its totient is φ = 60625368.

The previous prime is 212189147. The next prime is 212189177. The reversal of 212189166 is 661981212.

212189166 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212189166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280296 + ... + 281051.

It is an arithmetic number, because the mean of its divisors is an integer number (16840440).

Almost surely, 2^212189166 is an apocalyptic number.

212189166 is an abundant number, since it is smaller than the sum of its proper divisors (326704914).

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

212189166 is a wasteful number, since it uses less digits than its factorization.

212189166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561365 (or 561359 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 212189166 is about 14566.7143172371. The cubic root of 212189166 is about 596.4504930753.

The spelling of 212189166 in words is "two hundred twelve million, one hundred eighty-nine thousand, one hundred sixty-six".