231322021111 has 4 divisors (see below), whose sum is σ = 238784021824. Its totient is φ = 223860020400.

The previous prime is 231322021109. The next prime is 231322021171. The reversal of 231322021111 is 111120223132.

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 231322021111 - 2¹ = 231322021109 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 (231322021171) 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, 3731000310 + ... + 3731000371.

It is an arithmetic number, because the mean of its divisors is an integer number (59696005456).

Almost surely, 2^231322021111 is an apocalyptic number.

231322021111 is a deficient number, since it is larger than the sum of its proper divisors (7462000713).

231322021111 is an equidigital number, since it uses as much as digits as its factorization.

231322021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7462000712.

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

Adding to 231322021111 its reverse (111120223132), we get a palindrome (342442244243).

The spelling of 231322021111 in words is "two hundred thirty-one billion, three hundred twenty-two million, twenty-one thousand, one hundred eleven".