12105203525 has 24 divisors (see below), whose sum is σ = 15808288800. Its totient is φ = 9169934400.

The previous prime is 12105203521. The next prime is 12105203527. The reversal of 12105203525 is 52530250121.

It is not a de Polignac number, because 12105203525 - 2² = 12105203521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12105203494 and 12105203503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12105203521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1197191 + ... + 1207259.

It is an arithmetic number, because the mean of its divisors is an integer number (658678700).

Almost surely, 2^12105203525 is an apocalyptic number.

It is an amenable number.

12105203525 is a deficient number, since it is larger than the sum of its proper divisors (3703085275).

12105203525 is a wasteful number, since it uses less digits than its factorization.

12105203525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12629 (or 12624 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 12105203525 its reverse (52530250121), we get a palindrome (64635453646).

The spelling of 12105203525 in words is "twelve billion, one hundred five million, two hundred three thousand, five hundred twenty-five".