212133564 has 18 divisors (see below), whose sum is σ = 536226600. Its totient is φ = 70711176.

The previous prime is 212133563. The next prime is 212133569. The reversal of 212133564 is 465331212.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212133563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2946264 + ... + 2946335.

Almost surely, 2^212133564 is an apocalyptic number.

It is an amenable number.

212133564 is an abundant number, since it is smaller than the sum of its proper divisors (324093036).

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

212133564 is a wasteful number, since it uses less digits than its factorization.

212133564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5892609 (or 5892604 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 212133564 is about 14564.8056629672. The cubic root of 212133564 is about 596.3983906076.

Adding to 212133564 its reverse (465331212), we get a palindrome (677464776).

The spelling of 212133564 in words is "two hundred twelve million, one hundred thirty-three thousand, five hundred sixty-four".