12221975866 has 16 divisors (see below), whose sum is σ = 18927659520. Its totient is φ = 5912825040.

The previous prime is 12221975863. The next prime is 12221975873. The reversal of 12221975866 is 66857912221.

It is not an unprimeable number, because it can be changed into a prime (12221975863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435075 + ... + 462313.

It is an arithmetic number, because the mean of its divisors is an integer number (1182978720).

Almost surely, 2^12221975866 is an apocalyptic number.

12221975866 is a deficient number, since it is larger than the sum of its proper divisors (6705683654).

12221975866 is a wasteful number, since it uses less digits than its factorization.

12221975866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34509.

The product of its digits is 725760, while the sum is 49.

The spelling of 12221975866 in words is "twelve billion, two hundred twenty-one million, nine hundred seventy-five thousand, eight hundred sixty-six".