11523513321 has 12 divisors (see below), whose sum is σ = 16701887748. Its totient is φ = 7656120864.

The previous prime is 11523513293. The next prime is 11523513329. The reversal of 11523513321 is 12331532511.

11523513321 is a `hidden beast` number, since 1 + 1 + 523 + 5 + 133 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9631263321 + 1892250000 = 98139^2 + 43500^2 .

It is not a de Polignac number, because 11523513321 - 2²³ = 11515124713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11523513329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2182330 + ... + 2187603.

It is an arithmetic number, because the mean of its divisors is an integer number (1391823979).

Almost surely, 2^11523513321 is an apocalyptic number.

It is an amenable number.

11523513321 is a deficient number, since it is larger than the sum of its proper divisors (5178374427).

11523513321 is a wasteful number, since it uses less digits than its factorization.

11523513321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370232 (or 4370229 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The spelling of 11523513321 in words is "eleven billion, five hundred twenty-three million, five hundred thirteen thousand, three hundred twenty-one".