12120105605 has 16 divisors (see below), whose sum is σ = 15452700480. Its totient is φ = 9099908352.

The previous prime is 12120105601. The next prime is 12120105607. The reversal of 12120105605 is 50650102121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12120105605 - 2² = 12120105601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120105601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 586004 + ... + 606333.

It is an arithmetic number, because the mean of its divisors is an integer number (965793780).

Almost surely, 2^12120105605 is an apocalyptic number.

It is an amenable number.

12120105605 is a deficient number, since it is larger than the sum of its proper divisors (3332594875).

12120105605 is a wasteful number, since it uses less digits than its factorization.

12120105605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192468.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 12120105605 its reverse (50650102121), we get a palindrome (62770207726).

The spelling of 12120105605 in words is "twelve billion, one hundred twenty million, one hundred five thousand, six hundred five".