12523133521 has 16 divisors (see below), whose sum is σ = 13717762128. Its totient is φ = 11385088000.

The previous prime is 12523133473. The next prime is 12523133533. The reversal of 12523133521 is 12533132521.

It can be written as a sum of positive squares in 8 ways, for example, as 404496 + 12522729025 = 636^2 + 111905^2 .

It is a cyclic number.

It is not a de Polignac number, because 12523133521 - 2²⁷ = 12388915793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12523133521.

It is not an unprimeable number, because it can be changed into a prime (12523133561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18550 + ... + 159343.

It is an arithmetic number, because the mean of its divisors is an integer number (857360133).

Almost surely, 2^12523133521 is an apocalyptic number.

It is an amenable number.

12523133521 is a deficient number, since it is larger than the sum of its proper divisors (1194628607).

12523133521 is a wasteful number, since it uses less digits than its factorization.

12523133521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178052.

The product of its digits is 5400, while the sum is 28.

The spelling of 12523133521 in words is "twelve billion, five hundred twenty-three million, one hundred thirty-three thousand, five hundred twenty-one".