11515427321 has 6 divisors (see below), whose sum is σ = 11796995322. Its totient is φ = 11233892880.

The previous prime is 11515427293. The next prime is 11515427323. The reversal of 11515427321 is 12372451511.

It can be written as a sum of positive squares in only one way, i.e., 7021602025 + 4493825296 = 83795^2 + 67036^2 .

It is not a de Polignac number, because 11515427321 - 2²⁶ = 11448318457 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 (11515427323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 678740 + ... + 695498.

It is an arithmetic number, because the mean of its divisors is an integer number (1966165887).

Almost surely, 2^11515427321 is an apocalyptic number.

It is an amenable number.

11515427321 is a deficient number, since it is larger than the sum of its proper divisors (281568001).

11515427321 is an frugal number, since it uses more digits than its factorization.

11515427321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33559 (or 16800 counting only the distinct ones).

The product of its digits is 8400, while the sum is 32.

Adding to 11515427321 its reverse (12372451511), we get a palindrome (23887878832).

The spelling of 11515427321 in words is "eleven billion, five hundred fifteen million, four hundred twenty-seven thousand, three hundred twenty-one".