56156027021 has 2 divisors, whose sum is σ = 56156027022. Its totient is φ = 56156027020.

The previous prime is 56156027017. The next prime is 56156027111. The reversal of 56156027021 is 12072065165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50622750025 + 5533276996 = 224995^2 + 74386^2 .

It is a cyclic number.

It is not a de Polignac number, because 56156027021 - 2² = 56156027017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56156027321) 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, 28078013510 + 28078013511.

It is an arithmetic number, because the mean of its divisors is an integer number (28078013511).

Almost surely, 2^56156027021 is an apocalyptic number.

It is an amenable number.

56156027021 is a deficient number, since it is larger than the sum of its proper divisors (1).

56156027021 is an equidigital number, since it uses as much as digits as its factorization.

56156027021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 56156027021 in words is "fifty-six billion, one hundred fifty-six million, twenty-seven thousand, twenty-one".