211112221111 has 32 divisors (see below), whose sum is σ = 233868602880. Its totient is φ = 188974512000.

The previous prime is 211112221109. The next prime is 211112221123. The reversal of 211112221111 is 111122211112.

It is a cyclic number.

It is not a de Polignac number, because 211112221111 - 2¹ = 211112221109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211112221211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 256515046 + ... + 256515868.

It is an arithmetic number, because the mean of its divisors is an integer number (7308393840).

Almost surely, 2^211112221111 is an apocalyptic number.

211112221111 is a deficient number, since it is larger than the sum of its proper divisors (22756381769).

211112221111 is a wasteful number, since it uses less digits than its factorization.

211112221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927.

The product of its digits is 16, while the sum is 16.

Adding to 211112221111 its reverse (111122211112), we get a palindrome (322234432223).

Subtracting from 211112221111 its reverse (111122211112), we obtain a palindrome (99990009999).

It can be divided in two parts, 2 and 11112221111, that multiplied together give a palindrome (22224442222).

The spelling of 211112221111 in words is "two hundred eleven billion, one hundred twelve million, two hundred twenty-one thousand, one hundred eleven".