23231221111 has 4 divisors (see below), whose sum is σ = 26549966992. Its totient is φ = 19912475232.

The previous prime is 23231221049. The next prime is 23231221159. The reversal of 23231221111 is 11112213232.

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 23231221111 - 2¹³ = 23231212919 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 (23231261111) 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, 1659372930 + ... + 1659372943.

It is an arithmetic number, because the mean of its divisors is an integer number (6637491748).

Almost surely, 2^23231221111 is an apocalyptic number.

23231221111 is a deficient number, since it is larger than the sum of its proper divisors (3318745881).

23231221111 is an equidigital number, since it uses as much as digits as its factorization.

23231221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318745880.

The product of its digits is 144, while the sum is 19.

Adding to 23231221111 its reverse (11112213232), we get a palindrome (34343434343).

The spelling of 23231221111 in words is "twenty-three billion, two hundred thirty-one million, two hundred twenty-one thousand, one hundred eleven".