12033413521 has 4 divisors (see below), whose sum is σ = 12033668592. Its totient is φ = 12033158452.

The previous prime is 12033413503. The next prime is 12033413551. The reversal of 12033413521 is 12531433021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12033413521 - 2⁵ = 12033413489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12033413551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33811 + ... + 158776.

It is an arithmetic number, because the mean of its divisors is an integer number (3008417148).

Almost surely, 2^12033413521 is an apocalyptic number.

It is an amenable number.

12033413521 is a deficient number, since it is larger than the sum of its proper divisors (255071).

12033413521 is an equidigital number, since it uses as much as digits as its factorization.

12033413521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255070.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 12033413521 its reverse (12531433021), we get a palindrome (24564846542).

The spelling of 12033413521 in words is "twelve billion, thirty-three million, four hundred thirteen thousand, five hundred twenty-one".