12111111122220 has 72 divisors (see below), whose sum is σ = 40076767720080. Its totient is φ = 2936026938240.

The previous prime is 12111111122207. The next prime is 12111111122237. The reversal of 12111111122220 is 2222111111121.

It is a happy number.

12111111122220 is a `hidden beast` number, since 1 + 211 + 1 + 111 + 122 + 220 = 666.

It is a super-2 number, since 2×12111111122220² (a number of 27 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 12111111122193 and 12111111122202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3058359415 + ... + 3058363374.

It is an arithmetic number, because the mean of its divisors is an integer number (556621773890).

Almost surely, 2^{12111111122220} is an apocalyptic number.

12111111122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111111122220 is an abundant number, since it is smaller than the sum of its proper divisors (27965656597860).

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

12111111122220 is a wasteful number, since it uses less digits than its factorization.

12111111122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6116722815 (or 6116722810 counting only the distinct ones).

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

Adding to 12111111122220 its reverse (2222111111121), we get a palindrome (14333222233341).

The spelling of 12111111122220 in words is "twelve trillion, one hundred eleven billion, one hundred eleven million, one hundred twenty-two thousand, two hundred twenty".