215213772 has 12 divisors (see below), whose sum is σ = 502165496. Its totient is φ = 71737920.

The previous prime is 215213759. The next prime is 215213773. The reversal of 215213772 is 277312512.

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

It is not an unprimeable number, because it can be changed into a prime (215213773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8967229 + ... + 8967252.

Almost surely, 2^215213772 is an apocalyptic number.

It is an amenable number.

215213772 is an abundant number, since it is smaller than the sum of its proper divisors (286951724).

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

215213772 is a wasteful number, since it uses less digits than its factorization.

215213772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17934488 (or 17934486 counting only the distinct ones).

The product of its digits is 5880, while the sum is 30.

The square root of 215213772 is about 14670.1660522299. The cubic root of 215213772 is about 599.2711260409.

The spelling of 215213772 in words is "two hundred fifteen million, two hundred thirteen thousand, seven hundred seventy-two".