204204321 has 12 divisors (see below), whose sum is σ = 305886672. Its totient is φ = 136136052.

The previous prime is 204204317. The next prime is 204204349. The reversal of 204204321 is 123402402.

It is not a de Polignac number, because 204204321 - 2² = 204204317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204204294 and 204204303.

It is not an unprimeable number, because it can be changed into a prime (204204421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 419931 + ... + 420416.

It is an arithmetic number, because the mean of its divisors is an integer number (25490556).

Almost surely, 2^204204321 is an apocalyptic number.

It is an amenable number.

204204321 is a deficient number, since it is larger than the sum of its proper divisors (101682351).

204204321 is an frugal number, since it uses more digits than its factorization.

204204321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840362 (or 840350 counting only the distinct ones).

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

The square root of 204204321 is about 14290.0077326781. The cubic root of 204204321 is about 588.8730003875.

Adding to 204204321 its reverse (123402402), we get a palindrome (327606723).

The spelling of 204204321 in words is "two hundred four million, two hundred four thousand, three hundred twenty-one".