12212120111112 has 80 divisors (see below), whose sum is σ = 36217317028860. Its totient is φ = 3831253364736.

The previous prime is 12212120111099. The next prime is 12212120111123. The reversal of 12212120111112 is 21111102121221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11526744751236 + 685375359876 = 3395106^2 + 827874^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 554279113 + ... + 554301144.

Almost surely, 2^{12212120111112} is an apocalyptic number.

12212120111112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12212120111112 is an abundant number, since it is smaller than the sum of its proper divisors (24005196917748).

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

12212120111112 is a wasteful number, since it uses less digits than its factorization.

12212120111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108580292 (or 1108580279 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12212120111112 its reverse (21111102121221), we get a palindrome (33323222232333).

The spelling of 12212120111112 in words is "twelve trillion, two hundred twelve billion, one hundred twenty million, one hundred eleven thousand, one hundred twelve".