12109391910909 has 24 divisors (see below), whose sum is σ = 17964676769312. Its totient is φ = 7854481029600.

The previous prime is 12109391910901. The next prime is 12109391910929. The reversal of 12109391910909 is 90901919390121.

It is not a de Polignac number, because 12109391910909 - 2³ = 12109391910901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12109391910901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9754422 + ... + 10925544.

Almost surely, 2^{12109391910909} is an apocalyptic number.

It is an amenable number.

12109391910909 is a deficient number, since it is larger than the sum of its proper divisors (5855284858403).

12109391910909 is a wasteful number, since it uses less digits than its factorization.

12109391910909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202217 (or 1202214 counting only the distinct ones).

The product of its (nonzero) digits is 354294, while the sum is 54.

The spelling of 12109391910909 in words is "twelve trillion, one hundred nine billion, three hundred ninety-one million, nine hundred ten thousand, nine hundred nine".