12232013051521 has 4 divisors (see below), whose sum is σ = 12239740161792. Its totient is φ = 12224285941252.

The previous prime is 12232013051491. The next prime is 12232013051563. The reversal of 12232013051521 is 12515031023221.

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 12232013051521 - 2¹⁹ = 12232012527233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12232013051521.

It is not an unprimeable number, because it can be changed into a prime (12232013051221) 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, 3863552761 + ... + 3863555926.

It is an arithmetic number, because the mean of its divisors is an integer number (3059935040448).

Almost surely, 2^{12232013051521} is an apocalyptic number.

It is an amenable number.

12232013051521 is a deficient number, since it is larger than the sum of its proper divisors (7727110271).

12232013051521 is an equidigital number, since it uses as much as digits as its factorization.

12232013051521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7727110270.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 12232013051521 its reverse (12515031023221), we get a palindrome (24747044074742).

The spelling of 12232013051521 in words is "twelve trillion, two hundred thirty-two billion, thirteen million, fifty-one thousand, five hundred twenty-one".