216222216 has 64 divisors (see below), whose sum is σ = 618900480. Its totient is φ = 61665600.

The previous prime is 216222211. The next prime is 216222229. The reversal of 216222216 is 612222612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (216222211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148291 + ... + 149741.

It is an arithmetic number, because the mean of its divisors is an integer number (9670320).

Almost surely, 2^216222216 is an apocalyptic number.

It is an amenable number.

216222216 is an abundant number, since it is smaller than the sum of its proper divisors (402678264).

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

216222216 is a wasteful number, since it uses less digits than its factorization.

216222216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2354 (or 2350 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 216222216 is about 14704.4964551664. The cubic root of 216222216 is about 600.2056850369.

Adding to 216222216 its reverse (612222612), we get a palindrome (828444828).

The spelling of 216222216 in words is "two hundred sixteen million, two hundred twenty-two thousand, two hundred sixteen".