216004122 has 72 divisors (see below), whose sum is σ = 510893760. Its totient is φ = 65772000.

The previous prime is 216004079. The next prime is 216004147. The reversal of 216004122 is 221400612.

216004122 is a `hidden beast` number, since 2 + 1 + 600 + 41 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 216004095 and 216004104.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 287247 + ... + 287997.

Almost surely, 2^216004122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216004122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255446880).

216004122 is an abundant number, since it is smaller than the sum of its proper divisors (294889638).

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

216004122 is a wasteful number, since it uses less digits than its factorization.

216004122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836 (or 804 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 216004122 is about 14697.0786893178. The cubic root of 216004122 is about 600.0038166424.

Adding to 216004122 its reverse (221400612), we get a palindrome (437404734).

The spelling of 216004122 in words is "two hundred sixteen million, four thousand, one hundred twenty-two".