56814475021 has 2 divisors, whose sum is σ = 56814475022. Its totient is φ = 56814475020.

The previous prime is 56814475019. The next prime is 56814475027. The reversal of 56814475021 is 12057441865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54585313225 + 2229161796 = 233635^2 + 47214^2 .

It is a cyclic number.

It is not a de Polignac number, because 56814475021 - 2¹ = 56814475019 is a prime.

Together with 56814475019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56814475027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28407237510 + 28407237511.

It is an arithmetic number, because the mean of its divisors is an integer number (28407237511).

Almost surely, 2^56814475021 is an apocalyptic number.

It is an amenable number.

56814475021 is a deficient number, since it is larger than the sum of its proper divisors (1).

56814475021 is an equidigital number, since it uses as much as digits as its factorization.

56814475021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 268800, while the sum is 43.

The spelling of 56814475021 in words is "fifty-six billion, eight hundred fourteen million, four hundred seventy-five thousand, twenty-one".