11520656215021 has 4 divisors (see below), whose sum is σ = 11520867498844. Its totient is φ = 11520444931200.

The previous prime is 11520656214913. The next prime is 11520656215039. The reversal of 11520656215021 is 12051265602511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5263404112521 + 6257252102500 = 2294211^2 + 2501450^2 .

It is a cyclic number.

It is not a de Polignac number, because 11520656215021 - 2³⁵ = 11486296476653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11520656215051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105560100 + ... + 105669181.

It is an arithmetic number, because the mean of its divisors is an integer number (2880216874711).

Almost surely, 2^{11520656215021} is an apocalyptic number.

It is an amenable number.

11520656215021 is a deficient number, since it is larger than the sum of its proper divisors (211283823).

11520656215021 is an equidigital number, since it uses as much as digits as its factorization.

11520656215021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211283822.

The product of its (nonzero) digits is 36000, while the sum is 37.

The spelling of 11520656215021 in words is "eleven trillion, five hundred twenty billion, six hundred fifty-six million, two hundred fifteen thousand, twenty-one".