56156443021 has 16 divisors (see below), whose sum is σ = 65412144000. Its totient is φ = 47212720128.

The previous prime is 56156443003. The next prime is 56156443067. The reversal of 56156443021 is 12034465165.

56156443021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56156443021 - 2¹⁹ = 56155918733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56156444021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34021 + ... + 336853.

It is an arithmetic number, because the mean of its divisors is an integer number (4088259000).

Almost surely, 2^56156443021 is an apocalyptic number.

It is an amenable number.

56156443021 is a deficient number, since it is larger than the sum of its proper divisors (9255700979).

56156443021 is a wasteful number, since it uses less digits than its factorization.

56156443021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303348.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 56156443021 in words is "fifty-six billion, one hundred fifty-six million, four hundred forty-three thousand, twenty-one".