204240321 has 12 divisors (see below), whose sum is σ = 299417872. Its totient is φ = 134127576.

The previous prime is 204240319. The next prime is 204240353. The reversal of 204240321 is 123042402.

It is not a de Polignac number, because 204240321 - 2¹ = 204240319 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 204240294 and 204240303.

It is not an unprimeable number, because it can be changed into a prime (204240371) 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, 168751 + ... + 169956.

Almost surely, 2^204240321 is an apocalyptic number.

It is an amenable number.

204240321 is a deficient number, since it is larger than the sum of its proper divisors (95177551).

204240321 is a wasteful number, since it uses less digits than its factorization.

204240321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338780 (or 338777 counting only the distinct ones).

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

The square root of 204240321 is about 14291.2672985988. The cubic root of 204240321 is about 588.9076032830.

Adding to 204240321 its reverse (123042402), we get a palindrome (327282723).

The spelling of 204240321 in words is "two hundred four million, two hundred forty thousand, three hundred twenty-one".