56105710121 has 4 divisors (see below), whose sum is σ = 56106396372. Its totient is φ = 56105023872.

The previous prime is 56105710081. The next prime is 56105710183. The reversal of 56105710121 is 12101750165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12101750165 = 5 ⋅2420350033.

It can be written as a sum of positive squares in 2 ways, for example, as 56093185600 + 12524521 = 236840^2 + 3539^2 .

It is a cyclic number.

It is not a de Polignac number, because 56105710121 - 2⁶ = 56105710057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56105710621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200816 + ... + 390561.

It is an arithmetic number, because the mean of its divisors is an integer number (14026599093).

Almost surely, 2^56105710121 is an apocalyptic number.

It is an amenable number.

56105710121 is a deficient number, since it is larger than the sum of its proper divisors (686251).

56105710121 is an equidigital number, since it uses as much as digits as its factorization.

56105710121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686250.

The product of its (nonzero) digits is 2100, while the sum is 29.

The spelling of 56105710121 in words is "fifty-six billion, one hundred five million, seven hundred ten thousand, one hundred twenty-one".