11520938721 has 8 divisors (see below), whose sum is σ = 15890950080. Its totient is φ = 7415776592.

The previous prime is 11520938687. The next prime is 11520938747. The reversal of 11520938721 is 12783902511.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11520938721 - 2⁷ = 11520938593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11520938721.

It is not an unprimeable number, because it can be changed into a prime (11520938771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66212205 + ... + 66212378.

It is an arithmetic number, because the mean of its divisors is an integer number (1986368760).

Almost surely, 2^11520938721 is an apocalyptic number.

It is an amenable number.

11520938721 is a deficient number, since it is larger than the sum of its proper divisors (4370011359).

11520938721 is a wasteful number, since it uses less digits than its factorization.

11520938721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132424615.

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 11520938721 in words is "eleven billion, five hundred twenty million, nine hundred thirty-eight thousand, seven hundred twenty-one".