12191882891 has 4 divisors (see below), whose sum is σ = 12200356800. Its totient is φ = 12183408984.

The previous prime is 12191882851. The next prime is 12191882903. The reversal of 12191882891 is 19828819121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12191882891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12191882821) 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 3 ways as a sum of consecutive naturals, for example, 4234796 + ... + 4237673.

It is an arithmetic number, because the mean of its divisors is an integer number (3050089200).

Almost surely, 2^12191882891 is an apocalyptic number.

12191882891 is a deficient number, since it is larger than the sum of its proper divisors (8473909).

12191882891 is an equidigital number, since it uses as much as digits as its factorization.

12191882891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8473908.

The product of its digits is 165888, while the sum is 50.

The spelling of 12191882891 in words is "twelve billion, one hundred ninety-one million, eight hundred eighty-two thousand, eight hundred ninety-one".