56572021 has 4 divisors (see below), whose sum is σ = 61714944. Its totient is φ = 51429100.

The previous prime is 56572013. The next prime is 56572037. The reversal of 56572021 is 12027565.

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 a cyclic number.

It is not a de Polignac number, because 56572021 - 2³ = 56572013 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 (56572051) 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, 2571445 + ... + 2571466.

It is an arithmetic number, because the mean of its divisors is an integer number (15428736).

Almost surely, 2^56572021 is an apocalyptic number.

It is an amenable number.

56572021 is a deficient number, since it is larger than the sum of its proper divisors (5142923).

56572021 is a wasteful number, since it uses less digits than its factorization.

56572021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5142922.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 56572021 is about 7521.4374291089. The cubic root of 56572021 is about 383.8844890016.

Adding to 56572021 its reverse (12027565), we get a palindrome (68599586).

The spelling of 56572021 in words is "fifty-six million, five hundred seventy-two thousand, twenty-one".