216122256 has 140 divisors (see below), whose sum is σ = 717777472. Its totient is φ = 61725888.

The previous prime is 216122243. The next prime is 216122261. The reversal of 216122256 is 652221612.

216122256 is a `hidden beast` number, since 21 + 612 + 2 + 25 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 80325 + ... + 82971.

Almost surely, 2^216122256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216122256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358888736).

216122256 is an abundant number, since it is smaller than the sum of its proper divisors (501655216).

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

216122256 is an equidigital number, since it uses as much as digits as its factorization.

216122256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2680 (or 2659 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 216122256 is about 14701.0971019173. The cubic root of 216122256 is about 600.1131786496.

Adding to 216122256 its reverse (652221612), we get a palindrome (868343868).

The spelling of 216122256 in words is "two hundred sixteen million, one hundred twenty-two thousand, two hundred fifty-six".