56121068521 has 12 divisors (see below), whose sum is σ = 65448157188. Its totient is φ = 47982588192.

The previous prime is 56121068513. The next prime is 56121068533. The reversal of 56121068521 is 12586012165.

It can be written as a sum of positive squares in 2 ways, for example, as 38273444496 + 17847624025 = 195636^2 + 133595^2 .

It is not a de Polignac number, because 56121068521 - 2³ = 56121068513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56121068561) 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 in 11 ways as a sum of consecutive naturals, for example, 1423026 + ... + 1461931.

It is an arithmetic number, because the mean of its divisors is an integer number (5454013099).

Almost surely, 2^56121068521 is an apocalyptic number.

It is an amenable number.

56121068521 is a deficient number, since it is larger than the sum of its proper divisors (9327088667).

56121068521 is a wasteful number, since it uses less digits than its factorization.

56121068521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885368 (or 2885361 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 56121068521 in words is "fifty-six billion, one hundred twenty-one million, sixty-eight thousand, five hundred twenty-one".