111112201221 has 32 divisors (see below), whose sum is σ = 171879628800. Its totient is φ = 62530940736.

The previous prime is 111112201219. The next prime is 111112201243. The reversal of 111112201221 is 122102211111.

It is a happy number.

It is not a de Polignac number, because 111112201221 - 2¹ = 111112201219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111112201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111112201201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11880255 + ... + 11889603.

It is an arithmetic number, because the mean of its divisors is an integer number (5371238400).

Almost surely, 2^111112201221 is an apocalyptic number.

It is an amenable number.

111112201221 is a deficient number, since it is larger than the sum of its proper divisors (60767427579).

111112201221 is an equidigital number, since it uses as much as digits as its factorization.

111112201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17873.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111112201221 its reverse (122102211111), we get a palindrome (233214412332).

The spelling of 111112201221 in words is "one hundred eleven billion, one hundred twelve million, two hundred one thousand, two hundred twenty-one".