111221210120111 has 16 divisors (see below), whose sum is σ = 137248824384000. Its totient is φ = 87767011327968.

The previous prime is 111221210120089. The next prime is 111221210120179. The reversal of 111221210120111 is 111021012122111.

It is not a de Polignac number, because 111221210120111 - 2⁶ = 111221210120047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111221210120111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221210126111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1612381211 + ... + 1612450188.

It is an arithmetic number, because the mean of its divisors is an integer number (8578051524000).

Almost surely, 2^{111221210120111} is an apocalyptic number.

111221210120111 is a deficient number, since it is larger than the sum of its proper divisors (26027614263889).

111221210120111 is a wasteful number, since it uses less digits than its factorization.

111221210120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3224831798.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 111221210120111 its reverse (111021012122111), we get a palindrome (222242222242222).

The spelling of 111221210120111 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, one hundred twenty thousand, one hundred eleven".