12005033521 has 16 divisors (see below), whose sum is σ = 13066461184. Its totient is φ = 10963802304.

The previous prime is 12005033507. The next prime is 12005033527. The reversal of 12005033521 is 12533050021.

It is not a de Polignac number, because 12005033521 - 2¹⁵ = 12005000753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12005033492 and 12005033501.

It is not an unprimeable number, because it can be changed into a prime (12005033527) 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, 596011 + ... + 615823.

It is an arithmetic number, because the mean of its divisors is an integer number (816653824).

Almost surely, 2^12005033521 is an apocalyptic number.

It is an amenable number.

12005033521 is a deficient number, since it is larger than the sum of its proper divisors (1061427663).

12005033521 is a wasteful number, since it uses less digits than its factorization.

12005033521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20320.

The product of its (nonzero) digits is 900, while the sum is 22.

Adding to 12005033521 its reverse (12533050021), we get a palindrome (24538083542).

The spelling of 12005033521 in words is "twelve billion, five million, thirty-three thousand, five hundred twenty-one".