56457021 has 4 divisors (see below), whose sum is σ = 75276032. Its totient is φ = 37638012.

The previous prime is 56457013. The next prime is 56457029. The reversal of 56457021 is 12075465.

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 an interprime number because it is at equal distance from previous prime (56457013) and next prime (56457029).

It is not a de Polignac number, because 56457021 - 2³ = 56457013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56457021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56457029) 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, 9409501 + ... + 9409506.

It is an arithmetic number, because the mean of its divisors is an integer number (18819008).

Almost surely, 2^56457021 is an apocalyptic number.

It is an amenable number.

56457021 is a deficient number, since it is larger than the sum of its proper divisors (18819011).

56457021 is a wasteful number, since it uses less digits than its factorization.

56457021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18819010.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 56457021 is about 7513.7887247380. The cubic root of 56457021 is about 383.6241915188.

The spelling of 56457021 in words is "fifty-six million, four hundred fifty-seven thousand, twenty-one".