216865122 has 32 divisors (see below), whose sum is σ = 437754240. Its totient is φ = 71621760.

The previous prime is 216865111. The next prime is 216865127. The reversal of 216865122 is 221568612.

216865122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216865122² = 94060962280149768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216865127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 493779 + ... + 494217.

It is an arithmetic number, because the mean of its divisors is an integer number (13679820).

Almost surely, 2^216865122 is an apocalyptic number.

216865122 is an abundant number, since it is smaller than the sum of its proper divisors (220889118).

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

216865122 is a wasteful number, since it uses less digits than its factorization.

216865122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018.

The product of its digits is 11520, while the sum is 33.

The square root of 216865122 is about 14726.3410934285. The cubic root of 216865122 is about 600.7999718233.

The spelling of 216865122 in words is "two hundred sixteen million, eight hundred sixty-five thousand, one hundred twenty-two".