12530003521 has 4 divisors (see below), whose sum is σ = 14320004032. Its totient is φ = 10740003012.

The previous prime is 12530003513. The next prime is 12530003543.

12530003521 is nontrivially palindromic in base 10.

12530003521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12530003521 - 2³ = 12530003513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12530003492 and 12530003501.

It is not an unprimeable number, because it can be changed into a prime (12530003501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 895000245 + ... + 895000258.

It is an arithmetic number, because the mean of its divisors is an integer number (3580001008).

Almost surely, 2^12530003521 is an apocalyptic number.

It is an amenable number.

12530003521 is a deficient number, since it is larger than the sum of its proper divisors (1790000511).

12530003521 is an equidigital number, since it uses as much as digits as its factorization.

12530003521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790000510.

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

It can be divided in two parts, 1253000 and 3521, that added together give a palindrome (1256521).

The spelling of 12530003521 in words is "twelve billion, five hundred thirty million, three thousand, five hundred twenty-one".