221112111111 has 32 divisors (see below), whose sum is σ = 304323747840. Its totient is φ = 142696692864.

The previous prime is 221112111109. The next prime is 221112111119. The reversal of 221112111111 is 111111211122.

221112111111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221112111111 - 2¹ = 221112111109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221112111119) 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, 17806741 + ... + 17819153.

It is an arithmetic number, because the mean of its divisors is an integer number (9510117120).

Almost surely, 2^221112111111 is an apocalyptic number.

221112111111 is a deficient number, since it is larger than the sum of its proper divisors (83211636729).

221112111111 is a wasteful number, since it uses less digits than its factorization.

221112111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13255.

The product of its digits is 8, while the sum is 15.

Adding to 221112111111 its reverse (111111211122), we get a palindrome (332223322233).

The spelling of 221112111111 in words is "two hundred twenty-one billion, one hundred twelve million, one hundred eleven thousand, one hundred eleven".