111221212 has 18 divisors (see below), whose sum is σ = 205423008. Its totient is φ = 52683048.

The previous prime is 111221207. The next prime is 111221219. The reversal of 111221212 is 212122111.

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 = 111221192 and 111221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221219) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 37068 + ... + 39955.

Almost surely, 2^111221212 is an apocalyptic number.

It is an amenable number.

111221212 is a deficient number, since it is larger than the sum of its proper divisors (94201796).

111221212 is a wasteful number, since it uses less digits than its factorization.

111221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77065 (or 77044 counting only the distinct ones).

The product of its digits is 16, while the sum is 13.

The square root of 111221212 is about 10546.1467844896. The cubic root of 111221212 is about 480.9085973079.

Adding to 111221212 its reverse (212122111), we get a palindrome (323343323).

The spelling of 111221212 in words is "one hundred eleven million, two hundred twenty-one thousand, two hundred twelve".