213123312111 has 16 divisors (see below), whose sum is σ = 285330487680. Its totient is φ = 141499308000.

The previous prime is 213123312091. The next prime is 213123312121. The reversal of 213123312111 is 111213321312.

It is not a de Polignac number, because 213123312111 - 2⁵ = 213123312079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213123312121) 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, 12181576 + ... + 12199058.

It is an arithmetic number, because the mean of its divisors is an integer number (17833155480).

Almost surely, 2^213123312111 is an apocalyptic number.

213123312111 is a deficient number, since it is larger than the sum of its proper divisors (72207175569).

213123312111 is a wasteful number, since it uses less digits than its factorization.

213123312111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33926.

The product of its digits is 216, while the sum is 21.

Adding to 213123312111 its reverse (111213321312), we get a palindrome (324336633423).

The spelling of 213123312111 in words is "two hundred thirteen billion, one hundred twenty-three million, three hundred twelve thousand, one hundred eleven".