12122221212112 has 40 divisors (see below), whose sum is σ = 25946296295040. Its totient is φ = 5440352436480.

The previous prime is 12122221212043. The next prime is 12122221212121. The reversal of 12122221212112 is 21121212222121.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435911773 + ... + 435939580.

It is an arithmetic number, because the mean of its divisors is an integer number (648657407376).

Almost surely, 2^{12122221212112} is an apocalyptic number.

It is an amenable number.

12122221212112 is an abundant number, since it is smaller than the sum of its proper divisors (13824075082928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12122221212112 is a wasteful number, since it uses less digits than its factorization.

12122221212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871851451 (or 871851445 counting only the distinct ones).

The product of its digits is 256, while the sum is 22.

Adding to 12122221212112 its reverse (21121212222121), we get a palindrome (33243433434233).

The spelling of 12122221212112 in words is "twelve trillion, one hundred twenty-two billion, two hundred twenty-one million, two hundred twelve thousand, one hundred twelve".