11520616721 has 4 divisors (see below), whose sum is σ = 11538590244. Its totient is φ = 11502643200.

The previous prime is 11520616649. The next prime is 11520616727. The reversal of 11520616721 is 12761602511.

11520616721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 5515141696 + 6005475025 = 74264^2 + 77495^2 .

It is a cyclic number.

It is not a de Polignac number, because 11520616721 - 2¹⁴ = 11520600337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11520616727) 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 3 ways as a sum of consecutive naturals, for example, 8985800 + ... + 8987081.

It is an arithmetic number, because the mean of its divisors is an integer number (2884647561).

Almost surely, 2^11520616721 is an apocalyptic number.

It is an amenable number.

11520616721 is a deficient number, since it is larger than the sum of its proper divisors (17973523).

11520616721 is an equidigital number, since it uses as much as digits as its factorization.

11520616721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17973522.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 11520616721 in words is "eleven billion, five hundred twenty million, six hundred sixteen thousand, seven hundred twenty-one".