211111220111 has 16 divisors (see below), whose sum is σ = 233831432448. Its totient is φ = 188981284800.

The previous prime is 211111220083. The next prime is 211111220141. The reversal of 211111220111 is 111022111112.

It is not a de Polignac number, because 211111220111 - 2¹⁰ = 211111219087 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 (211111220141) 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, 1886126 + ... + 1994916.

It is an arithmetic number, because the mean of its divisors is an integer number (14614464528).

Almost surely, 2^211111220111 is an apocalyptic number.

211111220111 is a deficient number, since it is larger than the sum of its proper divisors (22720212337).

211111220111 is a wasteful number, since it uses less digits than its factorization.

211111220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111502.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 211111220111 its reverse (111022111112), we get a palindrome (322133331223).

The spelling of 211111220111 in words is "two hundred eleven billion, one hundred eleven million, two hundred twenty thousand, one hundred eleven".