211100011111 has 6 divisors (see below), whose sum is σ = 232035549536. Its totient is φ = 191909100900.

The previous prime is 211100011091. The next prime is 211100011117. The reversal of 211100011111 is 111110001112.

It is not a de Polignac number, because 211100011111 - 2¹⁵ = 211099978343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100011117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 872313975 + ... + 872314216.

Almost surely, 2^211100011111 is an apocalyptic number.

211100011111 is a deficient number, since it is larger than the sum of its proper divisors (20935538425).

211100011111 is a wasteful number, since it uses less digits than its factorization.

211100011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744628213 (or 1744628202 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 211100011111 its reverse (111110001112), we get a palindrome (322210012223).

Subtracting from 211100011111 its reverse (111110001112), we obtain a palindrome (99990009999).

It can be divided in two parts, 21110001111 and 1, that added together give a palindrome (21110001112).

The spelling of 211100011111 in words is "two hundred eleven billion, one hundred million, eleven thousand, one hundred eleven".