212171864 has 8 divisors (see below), whose sum is σ = 397822260. Its totient is φ = 106085928.

The previous prime is 212171833. The next prime is 212171873. The reversal of 212171864 is 468171212.

It is a happy number.

212171864 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 (8).

It is a self number, because there is not a number n which added to its sum of digits gives 212171864.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13260734 + ... + 13260749.

Almost surely, 2^212171864 is an apocalyptic number.

It is an amenable number.

212171864 is a deficient number, since it is larger than the sum of its proper divisors (185650396).

212171864 is a wasteful number, since it uses less digits than its factorization.

212171864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26521489 (or 26521485 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 212171864 is about 14566.1204169127. The cubic root of 212171864 is about 596.4342810208.

The spelling of 212171864 in words is "two hundred twelve million, one hundred seventy-one thousand, eight hundred sixty-four".