211211211111 has 16 divisors (see below), whose sum is σ = 281830399200. Its totient is φ = 140699801088.

The previous prime is 211211211109. The next prime is 211211211157. The reversal of 211211211111 is 111112112112.

211211211111 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 211211211111 - 2¹ = 211211211109 is a prime.

It is a super-2 number, since 2×211211211111² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211211511) 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 15 ways as a sum of consecutive naturals, for example, 32149435 + ... + 32156003.

It is an arithmetic number, because the mean of its divisors is an integer number (17614399950).

Almost surely, 2^211211211111 is an apocalyptic number.

211211211111 is a deficient number, since it is larger than the sum of its proper divisors (70619188089).

211211211111 is a wasteful number, since it uses less digits than its factorization.

211211211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13138.

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

Adding to 211211211111 its reverse (111112112112), we get a palindrome (322323323223).

It can be divided in two parts, 2112112 and 11111, that multiplied together give a palindrome (23467676432).

The spelling of 211211211111 in words is "two hundred eleven billion, two hundred eleven million, two hundred eleven thousand, one hundred eleven".