56939879221 has 2 divisors, whose sum is σ = 56939879222. Its totient is φ = 56939879220.

The previous prime is 56939879209. The next prime is 56939879239. The reversal of 56939879221 is 12297893965.

56939879221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36218276721 + 20721602500 = 190311^2 + 143950^2 .

It is a cyclic number.

It is not a de Polignac number, because 56939879221 - 2¹¹ = 56939877173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56939879221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56939879201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28469939610 + 28469939611.

It is an arithmetic number, because the mean of its divisors is an integer number (28469939611).

Almost surely, 2^56939879221 is an apocalyptic number.

It is an amenable number.

56939879221 is a deficient number, since it is larger than the sum of its proper divisors (1).

56939879221 is an equidigital number, since it uses as much as digits as its factorization.

56939879221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14696640, while the sum is 61.

The spelling of 56939879221 in words is "fifty-six billion, nine hundred thirty-nine million, eight hundred seventy-nine thousand, two hundred twenty-one".