56304021 has 4 divisors (see below), whose sum is σ = 75072032. Its totient is φ = 37536012.

The previous prime is 56304013. The next prime is 56304077. The reversal of 56304021 is 12040365.

It is a happy number.

56304021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 56304021 - 2³ = 56304013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56304421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9384001 + ... + 9384006.

It is an arithmetic number, because the mean of its divisors is an integer number (18768008).

Almost surely, 2^56304021 is an apocalyptic number.

It is an amenable number.

56304021 is a deficient number, since it is larger than the sum of its proper divisors (18768011).

56304021 is a wasteful number, since it uses less digits than its factorization.

56304021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18768010.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 56304021 is about 7503.6005357428. The cubic root of 56304021 is about 383.2773341428.

Adding to 56304021 its reverse (12040365), we get a palindrome (68344386).

The spelling of 56304021 in words is "fifty-six million, three hundred four thousand, twenty-one".