221112111211 has 16 divisors (see below), whose sum is σ = 232878333600. Its totient is φ = 209656677888.

The previous prime is 221112111169. The next prime is 221112111217. The reversal of 221112111211 is 112111211122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221112111211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221112111217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47680 + ... + 666706.

It is an arithmetic number, because the mean of its divisors is an integer number (14554895850).

Almost surely, 2^221112111211 is an apocalyptic number.

221112111211 is a deficient number, since it is larger than the sum of its proper divisors (11766222389).

221112111211 is a wasteful number, since it uses less digits than its factorization.

221112111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619278.

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

Adding to 221112111211 its reverse (112111211122), we get a palindrome (333223322333).

It can be divided in two parts, 22111211121 and 1, that added together give a palindrome (22111211122).

The spelling of 221112111211 in words is "two hundred twenty-one billion, one hundred twelve million, one hundred eleven thousand, two hundred eleven".