111222222211221 has 48 divisors (see below), whose sum is σ = 163116398874240. Its totient is φ = 67360682188800.

The previous prime is 111222222211213. The next prime is 111222222211273. The reversal of 111222222211221 is 122112222222111.

It is not a de Polignac number, because 111222222211221 - 2³ = 111222222211213 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111222222211191 and 111222222211200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111222222211201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3350958736 + ... + 3350991926.

It is an arithmetic number, because the mean of its divisors is an integer number (3398258309880).

Almost surely, 2^{111222222211221} is an apocalyptic number.

111222222211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111222222211221 is a deficient number, since it is larger than the sum of its proper divisors (51894176663019).

111222222211221 is a wasteful number, since it uses less digits than its factorization.

111222222211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39338 (or 39327 counting only the distinct ones).

The product of its digits is 512, while the sum is 24.

Adding to 111222222211221 its reverse (122112222222111), we get a palindrome (233334444433332).

The spelling of 111222222211221 in words is "one hundred eleven trillion, two hundred twenty-two billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".