304311021 has 12 divisors (see below), whose sum is σ = 471992832. Its totient is φ = 173891928.

The previous prime is 304310971. The next prime is 304311023. The reversal of 304311021 is 120113403.

It is not a de Polignac number, because 304311021 - 2¹⁰ = 304309997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (304311023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1034925 + ... + 1035218.

It is an arithmetic number, because the mean of its divisors is an integer number (39332736).

Almost surely, 2^304311021 is an apocalyptic number.

It is an amenable number.

304311021 is a deficient number, since it is larger than the sum of its proper divisors (167681811).

304311021 is a wasteful number, since it uses less digits than its factorization.

304311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070160 (or 2070153 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 304311021 is about 17444.5126329170. The cubic root of 304311021 is about 672.6243113066.

Adding to 304311021 its reverse (120113403), we get a palindrome (424424424).

The spelling of 304311021 in words is "three hundred four million, three hundred eleven thousand, twenty-one".