111211212 has 96 divisors (see below), whose sum is σ = 320882688. Its totient is φ = 29251584.

The previous prime is 111211207. The next prime is 111211249. The reversal of 111211212 is 212112111.

It is a Harshad number since it is a multiple of its sum of digits (12).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66288 + ... + 67944.

It is an arithmetic number, because the mean of its divisors is an integer number (3342528).

Almost surely, 2^111211212 is an apocalyptic number.

111211212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111211212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160441344).

111211212 is an abundant number, since it is smaller than the sum of its proper divisors (209671476).

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

111211212 is a wasteful number, since it uses less digits than its factorization.

111211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735 (or 1733 counting only the distinct ones).

The product of its digits is 8, while the sum is 12.

The square root of 111211212 is about 10545.6726670232. The cubic root of 111211212 is about 480.8941839000.

Adding to 111211212 its reverse (212112111), we get a palindrome (323323323).

The spelling of 111211212 in words is "one hundred eleven million, two hundred eleven thousand, two hundred twelve".