111111220211221 has 8 divisors (see below), whose sum is σ = 112770221406560. Its totient is φ = 109452237391728.

The previous prime is 111111220211213. The next prime is 111111220211261. The reversal of 111111220211221 is 122112022111111.

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 111111220211221 - 2³ = 111111220211213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111220211261) 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 7 ways as a sum of consecutive naturals, for example, 7838830 + ... + 16842496.

It is an arithmetic number, because the mean of its divisors is an integer number (14096277675820).

Almost surely, 2^{111111220211221} is an apocalyptic number.

It is an amenable number.

111111220211221 is a deficient number, since it is larger than the sum of its proper divisors (1659001195339).

111111220211221 is an equidigital number, since it uses as much as digits as its factorization.

111111220211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9187923.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111111220211221 its reverse (122112022111111), we get a palindrome (233223242322332).

The spelling of 111111220211221 in words is "one hundred eleven trillion, one hundred eleven billion, two hundred twenty million, two hundred eleven thousand, two hundred twenty-one".