216855222 has 8 divisors (see below), whose sum is σ = 433710456. Its totient is φ = 72285072.

The previous prime is 216855211. The next prime is 216855241. The reversal of 216855222 is 222558612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

216855222 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18071263 + ... + 18071274.

It is an arithmetic number, because the mean of its divisors is an integer number (54213807).

Almost surely, 2^216855222 is an apocalyptic number.

216855222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216855222 is a wasteful number, since it uses less digits than its factorization.

216855222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36142542.

The product of its digits is 19200, while the sum is 33.

The square root of 216855222 is about 14726.0049572177. The cubic root of 216855222 is about 600.7908294123.

The spelling of 216855222 in words is "two hundred sixteen million, eight hundred fifty-five thousand, two hundred twenty-two".