111221022211221 has 16 divisors (see below), whose sum is σ = 159946547233536. Its totient is φ = 68338891709376.

The previous prime is 111221022211177. The next prime is 111221022211231. The reversal of 111221022211221 is 122112220122111.

It is not a de Polignac number, because 111221022211221 - 2¹⁸ = 111221021949077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221022211231) 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 15 ways as a sum of consecutive naturals, for example, 2183604765 + ... + 2183655698.

It is an arithmetic number, because the mean of its divisors is an integer number (9996659202096).

Almost surely, 2^{111221022211221} is an apocalyptic number.

It is an amenable number.

111221022211221 is a deficient number, since it is larger than the sum of its proper divisors (48725525022315).

111221022211221 is a wasteful number, since it uses less digits than its factorization.

111221022211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4367261132.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 111221022211221 its reverse (122112220122111), we get a palindrome (233333242333332).

The spelling of 111221022211221 in words is "one hundred eleven trillion, two hundred twenty-one billion, twenty-two million, two hundred eleven thousand, two hundred twenty-one".