12105521423 has 4 divisors (see below), whose sum is σ = 12121814928. Its totient is φ = 12089227920.

The previous prime is 12105521401. The next prime is 12105521447. The reversal of 12105521423 is 32412550121.

12105521423 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.

It is a cyclic number.

It is not a de Polignac number, because 12105521423 - 2¹² = 12105517327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12105521392 and 12105521401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12105721423) 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, 8145638 + ... + 8147123.

It is an arithmetic number, because the mean of its divisors is an integer number (3030453732).

Almost surely, 2^12105521423 is an apocalyptic number.

12105521423 is a deficient number, since it is larger than the sum of its proper divisors (16293505).

12105521423 is an equidigital number, since it uses as much as digits as its factorization.

12105521423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16293504.

The product of its (nonzero) digits is 2400, while the sum is 26.

The spelling of 12105521423 in words is "twelve billion, one hundred five million, five hundred twenty-one thousand, four hundred twenty-three".