23111213111 has 4 divisors (see below), whose sum is σ = 26412814992. Its totient is φ = 19809611232.

The previous prime is 23111213089. The next prime is 23111213123. The reversal of 23111213111 is 11131211132.

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 23111213111 - 2¹⁴ = 23111196727 is a prime.

It is a super-3 number, since 3×23111213111³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23111213111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23111213131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1650800930 + ... + 1650800943.

It is an arithmetic number, because the mean of its divisors is an integer number (6603203748).

Almost surely, 2^23111213111 is an apocalyptic number.

23111213111 is a deficient number, since it is larger than the sum of its proper divisors (3301601881).

23111213111 is an equidigital number, since it uses as much as digits as its factorization.

23111213111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3301601880.

The product of its digits is 36, while the sum is 17.

Adding to 23111213111 its reverse (11131211132), we get a palindrome (34242424243).

The spelling of 23111213111 in words is "twenty-three billion, one hundred eleven million, two hundred thirteen thousand, one hundred eleven".