216922 has 4 divisors (see below), whose sum is σ = 325386. Its totient is φ = 108460.

The previous prime is 216919. The next prime is 216947. The reversal of 216922 is 229612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 210681 + 6241 = 459^2 + 79^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 216893 and 216902.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 54229 + ... + 54232.

2²¹⁶⁹²² is an apocalyptic number.

216922 is a deficient number, since it is larger than the sum of its proper divisors (108464).

216922 is a wasteful number, since it uses less digits than its factorization.

216922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108463.

The product of its digits is 432, while the sum is 22.

The square root of 216922 is about 465.7488593652. The cubic root of 216922 is about 60.0852491893.

The spelling of 216922 in words is "two hundred sixteen thousand, nine hundred twenty-two".