216522412 has 12 divisors (see below), whose sum is σ = 380111760. Its totient is φ = 107919056.

The previous prime is 216522407. The next prime is 216522419. The reversal of 216522412 is 214225612.

216522412 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (216522419) 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, 84112 + ... + 86647.

It is an arithmetic number, because the mean of its divisors is an integer number (31675980).

Almost surely, 2^216522412 is an apocalyptic number.

It is an amenable number.

216522412 is a deficient number, since it is larger than the sum of its proper divisors (163589348).

216522412 is a wasteful number, since it uses less digits than its factorization.

216522412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171080 (or 171078 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 216522412 is about 14714.7005406158. The cubic root of 216522412 is about 600.4833253712.

The spelling of 216522412 in words is "two hundred sixteen million, five hundred twenty-two thousand, four hundred twelve".