204321216 has 112 divisors (see below), whose sum is σ = 596920320. Its totient is φ = 61163520.

The previous prime is 204321191. The next prime is 204321239. The reversal of 204321216 is 612123402.

It is a junction number, because it is equal to n+sod(n) for n = 204321192 and 204321201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187425 + ... + 188511.

Almost surely, 2^204321216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204321216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298460160).

204321216 is an abundant number, since it is smaller than the sum of its proper divisors (392599104).

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

204321216 is a wasteful number, since it uses less digits than its factorization.

204321216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202 (or 1192 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 204321216 is about 14294.0972432679. The cubic root of 204321216 is about 588.9853440413.

Adding to 204321216 its reverse (612123402), we get a palindrome (816444618).

The spelling of 204321216 in words is "two hundred four million, three hundred twenty-one thousand, two hundred sixteen".