304312121 has 4 divisors (see below), whose sum is σ = 322212852. Its totient is φ = 286411392.

The previous prime is 304312117. The next prime is 304312139. The reversal of 304312121 is 121213403.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 211382521 + 92929600 = 14539^2 + 9640^2 .

It is a cyclic number.

It is not a de Polignac number, because 304312121 - 2² = 304312117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 17900713 = 304312121 / (3 + 0 + 4 + 3 + 1 + 2 + 1 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 304312121.

It is not an unprimeable number, because it can be changed into a prime (304312111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8950340 + ... + 8950373.

It is an arithmetic number, because the mean of its divisors is an integer number (80553213).

Almost surely, 2^304312121 is an apocalyptic number.

It is an amenable number.

304312121 is a deficient number, since it is larger than the sum of its proper divisors (17900731).

304312121 is a wasteful number, since it uses less digits than its factorization.

304312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17900730.

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

The square root of 304312121 is about 17444.5441614277. The cubic root of 304312121 is about 672.6251217558.

Adding to 304312121 its reverse (121213403), we get a palindrome (425525524).

The spelling of 304312121 in words is "three hundred four million, three hundred twelve thousand, one hundred twenty-one".