111111212211 has 16 divisors (see below), whose sum is σ = 149058330624. Its totient is φ = 73620215424.

The previous prime is 111111212209. The next prime is 111111212227. The reversal of 111111212211 is 112212111111.

It is not a de Polignac number, because 111111212211 - 2¹ = 111111212209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111111212231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269275 + ... + 542891.

It is an arithmetic number, because the mean of its divisors is an integer number (9316145664).

Almost surely, 2^111111212211 is an apocalyptic number.

111111212211 is a deficient number, since it is larger than the sum of its proper divisors (37947118413).

111111212211 is a wasteful number, since it uses less digits than its factorization.

111111212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274450.

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

Adding to 111111212211 its reverse (112212111111), we get a palindrome (223323323322).

The spelling of 111111212211 in words is "one hundred eleven billion, one hundred eleven million, two hundred twelve thousand, two hundred eleven".