111111213213 has 96 divisors (see below), whose sum is σ = 223469955072. Its totient is φ = 53279985600.

The previous prime is 111111213211. The next prime is 111111213217. The reversal of 111111213213 is 312312111111.

It is not a de Polignac number, because 111111213213 - 2¹ = 111111213211 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111213211) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14848 + ... + 471638.

It is an arithmetic number, because the mean of its divisors is an integer number (2327812032).

Almost surely, 2^111111213213 is an apocalyptic number.

111111213213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

111111213213 is an abundant number, since it is smaller than the sum of its proper divisors (112358741859).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111111213213 is a wasteful number, since it uses less digits than its factorization.

111111213213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456837 (or 456825 counting only the distinct ones).

The product of its digits is 36, while the sum is 18.

Adding to 111111213213 its reverse (312312111111), we get a palindrome (423423324324).

The spelling of 111111213213 in words is "one hundred eleven billion, one hundred eleven million, two hundred thirteen thousand, two hundred thirteen".