12105020123 has 36 divisors (see below), whose sum is σ = 14684391072. Its totient is φ = 9948818880.

The previous prime is 12105020069. The next prime is 12105020143. The reversal of 12105020123 is 32102050121.

It is a happy number.

It is not a de Polignac number, because 12105020123 - 2³² = 7810052827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12105020143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6468878 + ... + 6470748.

It is an arithmetic number, because the mean of its divisors is an integer number (407899752).

Almost surely, 2^12105020123 is an apocalyptic number.

12105020123 is a deficient number, since it is larger than the sum of its proper divisors (2579370949).

12105020123 is a wasteful number, since it uses less digits than its factorization.

12105020123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100 (or 2064 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 12105020123 its reverse (32102050121), we get a palindrome (44207070244).

The spelling of 12105020123 in words is "twelve billion, one hundred five million, twenty thousand, one hundred twenty-three".