56371345421 has 2 divisors, whose sum is σ = 56371345422. Its totient is φ = 56371345420.

The previous prime is 56371345391. The next prime is 56371345439. The reversal of 56371345421 is 12454317365.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44356993321 + 12014352100 = 210611^2 + 109610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56371345421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56371345451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28185672710 + 28185672711.

It is an arithmetic number, because the mean of its divisors is an integer number (28185672711).

Almost surely, 2^56371345421 is an apocalyptic number.

It is an amenable number.

56371345421 is a deficient number, since it is larger than the sum of its proper divisors (1).

56371345421 is an equidigital number, since it uses as much as digits as its factorization.

56371345421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 41.

The spelling of 56371345421 in words is "fifty-six billion, three hundred seventy-one million, three hundred forty-five thousand, four hundred twenty-one".