111111222222 has 192 divisors, whose sum is σ = 331970655744. Its totient is φ = 25919896320.

The previous prime is 111111222191. The next prime is 111111222223. The reversal of 111111222222 is 222222111111.

111111222222 is a `hidden beast` number, since 111 + 111 + 222 + 222 = 666.

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 plaindrome in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 111111222195 and 111111222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111222223) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 583333 + ... + 749999.

It is an arithmetic number, because the mean of its divisors is an integer number (1729013832).

Almost surely, 2^111111222222 is an apocalyptic number.

It is a pronic number, being equal to 333333×333334.

It is a practical number, because each smaller number is the sum of distinct divisors of 111111222222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165985327872).

111111222222 is an abundant number, since it is smaller than the sum of its proper divisors (220859433522).

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

111111222222 is a wasteful number, since it uses less digits than its factorization.

111111222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166743 (or 166740 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 111111222222 its reverse (222222111111), we get a palindrome (333333333333).

Subtracting 111111222222 from its reverse (222222111111), we obtain a square (111110888889 = 333333²).

It can be divided in two parts, 111111 and 222222, that added together give a palindrome (333333).

The spelling of 111111222222 in words is "one hundred eleven billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty-two".