12191390910 has 48 divisors (see below), whose sum is σ = 32790644640. Its totient is φ = 3138932160.

The previous prime is 12191390903. The next prime is 12191390927. The reversal of 12191390910 is 1909319121.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2332906 + ... + 2338125.

It is an arithmetic number, because the mean of its divisors is an integer number (683138430).

Almost surely, 2^12191390910 is an apocalyptic number.

12191390910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12191390910 is an abundant number, since it is smaller than the sum of its proper divisors (20599253730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12191390910 is a wasteful number, since it uses less digits than its factorization.

12191390910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4671073 (or 4671070 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The spelling of 12191390910 in words is "twelve billion, one hundred ninety-one million, three hundred ninety thousand, nine hundred ten".