12105123 has 4 divisors (see below), whose sum is σ = 16140168. Its totient is φ = 8070080.

The previous prime is 12105113. The next prime is 12105131. The reversal of 12105123 is 32150121.

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 12105123 - 2²¹ = 10007971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12105113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2017518 + ... + 2017523.

It is an arithmetic number, because the mean of its divisors is an integer number (4035042).

Almost surely, 2^12105123 is an apocalyptic number.

12105123 is a deficient number, since it is larger than the sum of its proper divisors (4035045).

12105123 is an equidigital number, since it uses as much as digits as its factorization.

12105123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4035044.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 12105123 is about 3479.2417277332. The cubic root of 12105123 is about 229.6094379829.

Adding to 12105123 its reverse (32150121), we get a palindrome (44255244).

The spelling of 12105123 in words is "twelve million, one hundred five thousand, one hundred twenty-three".