304020321 has 16 divisors (see below), whose sum is σ = 442536960. Its totient is φ = 184119120.

The previous prime is 304020319. The next prime is 304020323. The reversal of 304020321 is 123020403.

It is an interprime number because it is at equal distance from previous prime (304020319) and next prime (304020323).

It is not a de Polignac number, because 304020321 - 2¹ = 304020319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 304020321.

It is not an unprimeable number, because it can be changed into a prime (304020323) 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, 59556 + ... + 64458.

It is an arithmetic number, because the mean of its divisors is an integer number (27658560).

Almost surely, 2^304020321 is an apocalyptic number.

It is an amenable number.

304020321 is a deficient number, since it is larger than the sum of its proper divisors (138516639).

304020321 is a wasteful number, since it uses less digits than its factorization.

304020321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6796.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 304020321 is about 17436.1785090656. The cubic root of 304020321 is about 672.4100631975.

Adding to 304020321 its reverse (123020403), we get a palindrome (427040724).

The spelling of 304020321 in words is "three hundred four million, twenty thousand, three hundred twenty-one".