111201221021111 has 16 divisors (see below), whose sum is σ = 121543232680800. Its totient is φ = 101114665331328.

The previous prime is 111201221021083. The next prime is 111201221021129. The reversal of 111201221021111 is 111120122102111.

It is a cyclic number.

It is not a de Polignac number, because 111201221021111 - 2³⁴ = 111184041151927 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 111201221021111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111201221021131) 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, 296326145 + ... + 296701173.

It is an arithmetic number, because the mean of its divisors is an integer number (7596452042550).

Almost surely, 2^{111201221021111} is an apocalyptic number.

111201221021111 is a deficient number, since it is larger than the sum of its proper divisors (10342011659689).

111201221021111 is a wasteful number, since it uses less digits than its factorization.

111201221021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715538.

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

Adding to 111201221021111 its reverse (111120122102111), we get a palindrome (222321343123222).

The spelling of 111201221021111 in words is "one hundred eleven trillion, two hundred one billion, two hundred twenty-one million, twenty-one thousand, one hundred eleven".