12221212112 has 20 divisors (see below), whose sum is σ = 23810886720. Its totient is φ = 6076467168.

The previous prime is 12221212109. The next prime is 12221212169. The reversal of 12221212112 is 21121212221.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2130728 + ... + 2136455.

It is an arithmetic number, because the mean of its divisors is an integer number (1190544336).

Almost surely, 2^12221212112 is an apocalyptic number.

It is an amenable number.

12221212112 is a deficient number, since it is larger than the sum of its proper divisors (11589674608).

12221212112 is a wasteful number, since it uses less digits than its factorization.

12221212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4267370 (or 4267364 counting only the distinct ones).

The product of its digits is 64, while the sum is 17.

Adding to 12221212112 its reverse (21121212221), we get a palindrome (33342424333).

The spelling of 12221212112 in words is "twelve billion, two hundred twenty-one million, two hundred twelve thousand, one hundred twelve".