304431021 has 8 divisors (see below), whose sum is σ = 451008960. Its totient is φ = 202953996.

The previous prime is 304430963. The next prime is 304431047. The reversal of 304431021 is 120134403.

It is not a de Polignac number, because 304431021 - 2¹¹ = 304428973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 304430985 and 304431003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (304431221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5637585 + ... + 5637638.

It is an arithmetic number, because the mean of its divisors is an integer number (56376120).

Almost surely, 2^304431021 is an apocalyptic number.

It is an amenable number.

304431021 is a deficient number, since it is larger than the sum of its proper divisors (146577939).

304431021 is a wasteful number, since it uses less digits than its factorization.

304431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11275232 (or 11275226 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 304431021 is about 17447.9517709100. The cubic root of 304431021 is about 672.7127124319.

Adding to 304431021 its reverse (120134403), we get a palindrome (424565424).

The spelling of 304431021 in words is "three hundred four million, four hundred thirty-one thousand, twenty-one".