111312321321 has 4 divisors (see below), whose sum is σ = 148416428432. Its totient is φ = 74208214212.

The previous prime is 111312321311. The next prime is 111312321349. The reversal of 111312321321 is 123123213111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 123123213111 = 3 ⋅41041071037.

It is not a de Polignac number, because 111312321321 - 2¹³ = 111312313129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111312321311) 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, 18552053551 + ... + 18552053556.

It is an arithmetic number, because the mean of its divisors is an integer number (37104107108).

Almost surely, 2^111312321321 is an apocalyptic number.

It is an amenable number.

111312321321 is a deficient number, since it is larger than the sum of its proper divisors (37104107111).

111312321321 is an equidigital number, since it uses as much as digits as its factorization.

111312321321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37104107110.

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

Adding to 111312321321 its reverse (123123213111), we get a palindrome (234435534432).

The spelling of 111312321321 in words is "one hundred eleven billion, three hundred twelve million, three hundred twenty-one thousand, three hundred twenty-one".