56720483021 has 4 divisors (see below), whose sum is σ = 57681847200. Its totient is φ = 55759118844.

The previous prime is 56720482997. The next prime is 56720483023. The reversal of 56720483021 is 12038402765.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-56720483021 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 (56720483023) 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, 480682001 + ... + 480682118.

It is an arithmetic number, because the mean of its divisors is an integer number (14420461800).

Almost surely, 2^56720483021 is an apocalyptic number.

It is an amenable number.

56720483021 is a deficient number, since it is larger than the sum of its proper divisors (961364179).

56720483021 is an equidigital number, since it uses as much as digits as its factorization.

56720483021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961364178.

The product of its (nonzero) digits is 80640, while the sum is 38.

Adding to 56720483021 its reverse (12038402765), we get a palindrome (68758885786).

The spelling of 56720483021 in words is "fifty-six billion, seven hundred twenty million, four hundred eighty-three thousand, twenty-one".