213223231111 has 4 divisors (see below), whose sum is σ = 232607161224. Its totient is φ = 193839301000.

The previous prime is 213223231103. The next prime is 213223231127. The reversal of 213223231111 is 111132322312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213223231111 - 2³ = 213223231103 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 (213223231181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9691965040 + ... + 9691965061.

It is an arithmetic number, because the mean of its divisors is an integer number (58151790306).

Almost surely, 2^213223231111 is an apocalyptic number.

213223231111 is a deficient number, since it is larger than the sum of its proper divisors (19383930113).

213223231111 is a wasteful number, since it uses less digits than its factorization.

213223231111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19383930112.

The product of its digits is 432, while the sum is 22.

Adding to 213223231111 its reverse (111132322312), we get a palindrome (324355553423).

The spelling of 213223231111 in words is "two hundred thirteen billion, two hundred twenty-three million, two hundred thirty-one thousand, one hundred eleven".