216204 has 24 divisors (see below), whose sum is σ = 517440. Its totient is φ = 70224.

The previous prime is 216179. The next prime is 216211. The reversal of 216204 is 402612.

It is an Ulam number.

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307 + ... + 725.

It is an arithmetic number, because the mean of its divisors is an integer number (21560).

2²¹⁶²⁰⁴ is an apocalyptic number.

It is an amenable number.

216204 is an abundant number, since it is smaller than the sum of its proper divisors (301236).

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

216204 is a wasteful number, since it uses less digits than its factorization.

216204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469 (or 467 counting only the distinct ones).

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

The square root of 216204 is about 464.9774188065. The cubic root of 216204 is about 60.0188829455.

Adding to 216204 its reverse (402612), we get a palindrome (618816).

The spelling of 216204 in words is "two hundred sixteen thousand, two hundred four".