12100012191 has 24 divisors (see below), whose sum is σ = 18612912240. Its totient is φ = 7548262656.

The previous prime is 12100012147. The next prime is 12100012207. The reversal of 12100012191 is 19121000121.

It is a happy number.

It is not a de Polignac number, because 12100012191 - 2¹⁹ = 12099487903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100012091) 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, 202101 + ... + 255038.

It is an arithmetic number, because the mean of its divisors is an integer number (775538010).

Almost surely, 2^12100012191 is an apocalyptic number.

12100012191 is a deficient number, since it is larger than the sum of its proper divisors (6512900049).

12100012191 is a wasteful number, since it uses less digits than its factorization.

12100012191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457335 (or 457332 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

It can be divided in two parts, 121000121 and 91, that multiplied together give a palindrome (11011011011).

The spelling of 12100012191 in words is "twelve billion, one hundred million, twelve thousand, one hundred ninety-one".