204311321 has 8 divisors (see below), whose sum is σ = 216677664. Its totient is φ = 191983680.

The previous prime is 204311311. The next prime is 204311339. The reversal of 204311321 is 123113402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204311321 - 2¹⁰ = 204310297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204311321.

It is not an unprimeable number, because it can be changed into a prime (204311311) 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 7 ways as a sum of consecutive naturals, for example, 1586 + ... + 20276.

It is an arithmetic number, because the mean of its divisors is an integer number (27084708).

Almost surely, 2^204311321 is an apocalyptic number.

It is an amenable number.

204311321 is a deficient number, since it is larger than the sum of its proper divisors (12366343).

204311321 is a wasteful number, since it uses less digits than its factorization.

204311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19351.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 204311321 is about 14293.7511171840. The cubic root of 204311321 is about 588.9758359667.

Adding to 204311321 its reverse (123113402), we get a palindrome (327424723).

The spelling of 204311321 in words is "two hundred four million, three hundred eleven thousand, three hundred twenty-one".