12105450121 has 16 divisors (see below), whose sum is σ = 12811147776. Its totient is φ = 11419920000.

The previous prime is 12105450113. The next prime is 12105450163.

12105450121 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 12105450121 - 2³ = 12105450113 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12105450092 and 12105450101.

It is not an unprimeable number, because it can be changed into a prime (12105450821) 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 15 ways as a sum of consecutive naturals, for example, 1942791 + ... + 1949011.

It is an arithmetic number, because the mean of its divisors is an integer number (800696736).

Almost surely, 2^12105450121 is an apocalyptic number.

It is an amenable number.

12105450121 is a deficient number, since it is larger than the sum of its proper divisors (705697655).

12105450121 is a wasteful number, since it uses less digits than its factorization.

12105450121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7824.

The product of its (nonzero) digits is 400, while the sum is 22.

The spelling of 12105450121 in words is "twelve billion, one hundred five million, four hundred fifty thousand, one hundred twenty-one".