56423021 has 4 divisors (see below), whose sum is σ = 56474652. Its totient is φ = 56371392.

The previous prime is 56422997. The next prime is 56423023. The reversal of 56423021 is 12032465.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27144100 + 29278921 = 5210^2 + 5411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56423021 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 (56423023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24140 + ... + 26373.

It is an arithmetic number, because the mean of its divisors is an integer number (14118663).

Almost surely, 2^56423021 is an apocalyptic number.

It is an amenable number.

56423021 is a deficient number, since it is larger than the sum of its proper divisors (51631).

56423021 is a wasteful number, since it uses less digits than its factorization.

56423021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51630.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 56423021 is about 7511.5258769440. The cubic root of 56423021 is about 383.5471663087.

Adding to 56423021 its reverse (12032465), we get a palindrome (68455486).

The spelling of 56423021 in words is "fifty-six million, four hundred twenty-three thousand, twenty-one".