12211122222 has 32 divisors (see below), whose sum is σ = 29223200160. Its totient is φ = 3757268160.

The previous prime is 12211122221. The next prime is 12211122229. The reversal of 12211122222 is 22222111221.

It is a happy number.

It is a super-2 number, since 2×12211122222² (a number of 21 digits) contains 22 as substring.

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

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

It is a junction number, because it is equal to n+sod(n) for n = 12211122195 and 12211122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211122221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8696679 + ... + 8698082.

It is an arithmetic number, because the mean of its divisors is an integer number (913225005).

Almost surely, 2^12211122222 is an apocalyptic number.

12211122222 is an abundant number, since it is smaller than the sum of its proper divisors (17012077938).

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

12211122222 is a wasteful number, since it uses less digits than its factorization.

12211122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17394785 (or 17394779 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

Adding to 12211122222 its reverse (22222111221), we get a palindrome (34433233443).

The spelling of 12211122222 in words is "twelve billion, two hundred eleven million, one hundred twenty-two thousand, two hundred twenty-two".