12120221198 has 24 divisors (see below), whose sum is σ = 19023225312. Its totient is φ = 5790742272.

The previous prime is 12120221189. The next prime is 12120221221. The reversal of 12120221198 is 89112202121.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 12120221198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126011 + ... + 200297.

It is an arithmetic number, because the mean of its divisors is an integer number (792634388).

Almost surely, 2^12120221198 is an apocalyptic number.

12120221198 is a deficient number, since it is larger than the sum of its proper divisors (6903004114).

12120221198 is an equidigital number, since it uses as much as digits as its factorization.

12120221198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74444 (or 74415 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 12120221198 in words is "twelve billion, one hundred twenty million, two hundred twenty-one thousand, one hundred ninety-eight".