11122221222 has 48 divisors (see below), whose sum is σ = 27547052832. Its totient is φ = 3177048960.

The previous prime is 11122221211. The next prime is 11122221247. The reversal of 11122221222 is 22212222111.

It is a happy number.

It is a super-2 number, since 2×11122221222² (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 = 11122221195 and 11122221204.

It is a congruent number.

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, 794548 + ... + 808424.

It is an arithmetic number, because the mean of its divisors is an integer number (573896934).

Almost surely, 2^11122221222 is an apocalyptic number.

11122221222 is an abundant number, since it is smaller than the sum of its proper divisors (16424831610).

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

11122221222 is a wasteful number, since it uses less digits than its factorization.

11122221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20253 (or 20250 counting only the distinct ones).

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

Adding to 11122221222 its reverse (22212222111), we get a palindrome (33334443333).

The spelling of 11122221222 in words is "eleven billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-two".