216822 has 8 divisors (see below), whose sum is σ = 433656. Its totient is φ = 72272.

The previous prime is 216803. The next prime is 216829. The reversal of 216822 is 228612.

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

216822 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216829) by changing a digit.

216822 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18063 + ... + 18074.

It is an arithmetic number, because the mean of its divisors is an integer number (54207).

2²¹⁶⁸²² is an apocalyptic number.

216822 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.

216822 is a wasteful number, since it uses less digits than its factorization.

216822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36142.

The product of its digits is 384, while the sum is 21.

The square root of 216822 is about 465.6414929965. The cubic root of 216822 is about 60.0760147664.

The spelling of 216822 in words is "two hundred sixteen thousand, eight hundred twenty-two".