204324021 has 24 divisors (see below), whose sum is σ = 327431520. Its totient is φ = 121730400.

The previous prime is 204324017. The next prime is 204324031. The reversal of 204324021 is 120423402.

It is not a de Polignac number, because 204324021 - 2² = 204324017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204323985 and 204324003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204324011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11650 + ... + 23331.

It is an arithmetic number, because the mean of its divisors is an integer number (13642980).

Almost surely, 2^204324021 is an apocalyptic number.

It is an amenable number.

204324021 is a deficient number, since it is larger than the sum of its proper divisors (123107499).

204324021 is a wasteful number, since it uses less digits than its factorization.

204324021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35057 (or 35054 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 204324021 is about 14294.1953603552. The cubic root of 204324021 is about 588.9880393012.

Adding to 204324021 its reverse (120423402), we get a palindrome (324747423).

The spelling of 204324021 in words is "two hundred four million, three hundred twenty-four thousand, twenty-one".