111111212212 has 192 divisors, whose sum is σ = 272193159168. Its totient is φ = 38283840000.

The previous prime is 111111212209. The next prime is 111111212227. The reversal of 111111212212 is 212212111111.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12532093 + ... + 12540955.

It is an arithmetic number, because the mean of its divisors is an integer number (1417672704).

Almost surely, 2^111111212212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111111212212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136096579584).

111111212212 is an abundant number, since it is smaller than the sum of its proper divisors (161081946956).

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

111111212212 is a wasteful number, since it uses less digits than its factorization.

111111212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9030 (or 9028 counting only the distinct ones).

The product of its digits is 16, while the sum is 16.

Adding to 111111212212 its reverse (212212111111), we get a palindrome (323323323323).

It can be divided in two parts, 111111 and 212212, that added together give a palindrome (323323).

The spelling of 111111212212 in words is "one hundred eleven billion, one hundred eleven million, two hundred twelve thousand, two hundred twelve".