12533833521 has 18 divisors (see below), whose sum is σ = 19899908210. Its totient is φ = 7596262080.

The previous prime is 12533833513. The next prime is 12533833573.

12533833521 is a `hidden beast` number, since 1 + 2 + 53 + 3 + 83 + 3 + 521 = 666.

12533833521 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 10017807921 + 2516025600 = 100089^2 + 50160^2 .

It is not a de Polignac number, because 12533833521 - 2³ = 12533833513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12533833021) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5753656 + ... + 5755833.

Almost surely, 2^12533833521 is an apocalyptic number.

12533833521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12533833521 is a deficient number, since it is larger than the sum of its proper divisors (7366074689).

12533833521 is a wasteful number, since it uses less digits than its factorization.

12533833521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11509517 (or 11509503 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The spelling of 12533833521 in words is "twelve billion, five hundred thirty-three million, eight hundred thirty-three thousand, five hundred twenty-one".