204321 has 16 divisors (see below), whose sum is σ = 304640. Its totient is φ = 121680.

The previous prime is 204319. The next prime is 204329. The reversal of 204321 is 123402.

204321 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 204321 - 2¹ = 204319 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 204297 and 204306.

It is not an unprimeable number, because it can be changed into a prime (204329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6576 + ... + 6606.

It is an arithmetic number, because the mean of its divisors is an integer number (19040).

2²⁰⁴³²¹ is an apocalyptic number.

It is an amenable number.

204321 is a deficient number, since it is larger than the sum of its proper divisors (100319).

204321 is an equidigital number, since it uses as much as digits as its factorization.

204321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 204321 is about 452.0188049186. The cubic root of 204321 is about 58.8985136491.

Adding to 204321 its reverse (123402), we get a palindrome (327723).

It can be divided in two parts, 204 and 321, that added together give a palindrome (525).

The spelling of 204321 in words is "two hundred four thousand, three hundred twenty-one", and thus it is an iban number.