304021 has 2 divisors, whose sum is σ = 304022. Its totient is φ = 304020.

The previous prime is 304013. The next prime is 304033. The reversal of 304021 is 120403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302500 + 1521 = 550^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 304021 - 2³ = 304013 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 303989 and 304007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (304081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152010 + 152011.

It is an arithmetic number, because the mean of its divisors is an integer number (152011).

2³⁰⁴⁰²¹ is an apocalyptic number.

It is an amenable number.

304021 is a deficient number, since it is larger than the sum of its proper divisors (1).

304021 is an equidigital number, since it uses as much as digits as its factorization.

304021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 304021 is about 551.3809935063. The cubic root of 304021 is about 67.2410563785.

Adding to 304021 its reverse (120403), we get a palindrome (424424).

It can be divided in two parts, 30402 and 1, that added together give a palindrome (30403).

The spelling of 304021 in words is "three hundred four thousand, twenty-one", and thus it is an iban number.