213209255772 has 72 divisors (see below), whose sum is σ = 542897571216. Its totient is φ = 70549657344.

The previous prime is 213209255731. The next prime is 213209255773. The reversal of 213209255772 is 277552902312.

213209255772 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 0 + 92 + 557 + 7 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213209255773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5007678 + ... + 5050074.

Almost surely, 2^213209255772 is an apocalyptic number.

It is an amenable number.

213209255772 is an abundant number, since it is smaller than the sum of its proper divisors (329688315444).

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

213209255772 is a wasteful number, since it uses less digits than its factorization.

213209255772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43427 (or 43422 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 45.

The spelling of 213209255772 in words is "two hundred thirteen billion, two hundred nine million, two hundred fifty-five thousand, seven hundred seventy-two".