111221212211 has 8 divisors (see below), whose sum is σ = 111630454320. Its totient is φ = 110812084992.

The previous prime is 111221212187. The next prime is 111221212229. The reversal of 111221212211 is 112212122111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111221212211 - 2¹⁸ = 111220950067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111221212211.

It is not an unprimeable number, because it can be changed into a prime (111221212411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2237435 + ... + 2286603.

It is an arithmetic number, because the mean of its divisors is an integer number (13953806790).

Almost surely, 2^111221212211 is an apocalyptic number.

111221212211 is a deficient number, since it is larger than the sum of its proper divisors (409242109).

111221212211 is an equidigital number, since it uses as much as digits as its factorization.

111221212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57445.

The product of its digits is 32, while the sum is 17.

Adding to 111221212211 its reverse (112212122111), we get a palindrome (223433334322).

The spelling of 111221212211 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred twelve thousand, two hundred eleven".