12198912197 has 4 divisors (see below), whose sum is σ = 12220351980. Its totient is φ = 12177472416.

The previous prime is 12198912191. The next prime is 12198912199. The reversal of 12198912197 is 79121989121.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4983089281 + 7215822916 = 70591^2 + 84946^2 .

It is a cyclic number.

It is not a de Polignac number, because 12198912197 - 2⁸ = 12198911941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12198912191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10719038 + ... + 10720175.

It is an arithmetic number, because the mean of its divisors is an integer number (3055087995).

Almost surely, 2^12198912197 is an apocalyptic number.

It is an amenable number.

12198912197 is a deficient number, since it is larger than the sum of its proper divisors (21439783).

12198912197 is an equidigital number, since it uses as much as digits as its factorization.

12198912197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21439782.

The product of its digits is 163296, while the sum is 50.

The spelling of 12198912197 in words is "twelve billion, one hundred ninety-eight million, nine hundred twelve thousand, one hundred ninety-seven".