11328707521 has 4 divisors (see below), whose sum is σ = 11440873044. Its totient is φ = 11216542000.

The previous prime is 11328707491. The next prime is 11328707603. The reversal of 11328707521 is 12570782311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12570782311 = 17 ⋅739457783.

It can be written as a sum of positive squares in 2 ways, for example, as 6121497600 + 5207209921 = 78240^2 + 72161^2 .

It is a cyclic number.

It is not a de Polignac number, because 11328707521 - 2¹⁹ = 11328183233 is a prime.

It is a super-2 number, since 2×11328707521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11328701521) 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, 56082610 + ... + 56082811.

It is an arithmetic number, because the mean of its divisors is an integer number (2860218261).

Almost surely, 2^11328707521 is an apocalyptic number.

It is an amenable number.

11328707521 is a deficient number, since it is larger than the sum of its proper divisors (112165523).

11328707521 is a wasteful number, since it uses less digits than its factorization.

11328707521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112165522.

The product of its (nonzero) digits is 23520, while the sum is 37.

The spelling of 11328707521 in words is "eleven billion, three hundred twenty-eight million, seven hundred seven thousand, five hundred twenty-one".