213113211111 has 16 divisors (see below), whose sum is σ = 316157587200. Its totient is φ = 141880033944.

The previous prime is 213113211083. The next prime is 213113211149. The reversal of 213113211111 is 111112311312.

213113211111 is a `hidden beast` number, since 21 + 311 + 321 + 1 + 1 + 11 = 666.

213113211111 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 213113211111 - 2⁷ = 213113210983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213113211011) 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, 5408901 + ... + 5448158.

It is an arithmetic number, because the mean of its divisors is an integer number (19759849200).

Almost surely, 2^213113211111 is an apocalyptic number.

213113211111 is a deficient number, since it is larger than the sum of its proper divisors (103044376089).

213113211111 is a wasteful number, since it uses less digits than its factorization.

213113211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10857795 (or 10857789 counting only the distinct ones).

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

Adding to 213113211111 its reverse (111112311312), we get a palindrome (324225522423).

The spelling of 213113211111 in words is "two hundred thirteen billion, one hundred thirteen million, two hundred eleven thousand, one hundred eleven".