216222 has 8 divisors (see below), whose sum is σ = 432456. Its totient is φ = 72072.

The previous prime is 216217. The next prime is 216233. The reversal of 216222 is 222612.

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

216222 is an admirable number.

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

216222 is a modest number, since divided by 222 gives 216 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18013 + ... + 18024.

It is an arithmetic number, because the mean of its divisors is an integer number (54057).

2²¹⁶²²² is an apocalyptic number.

216222 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.

216222 is a wasteful number, since it uses less digits than its factorization.

216222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36042.

The product of its digits is 96, while the sum is 15.

The square root of 216222 is about 464.9967741824. The cubic root of 216222 is about 60.0205485174.

Adding to 216222 its reverse (222612), we get a palindrome (438834).

The spelling of 216222 in words is "two hundred sixteen thousand, two hundred twenty-two".