12113231321 has 4 divisors (see below), whose sum is σ = 12114537444. Its totient is φ = 12111925200.

The previous prime is 12113231297. The next prime is 12113231371. The reversal of 12113231321 is 12313231121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12313231121 = 17 ⋅724307713.

It can be written as a sum of positive squares in 2 ways, for example, as 8021710096 + 4091521225 = 89564^2 + 63965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12113231321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12113231293 and 12113231302.

It is not an unprimeable number, because it can be changed into a prime (12113231371) 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, 639050 + ... + 657731.

It is an arithmetic number, because the mean of its divisors is an integer number (3028634361).

Almost surely, 2^12113231321 is an apocalyptic number.

It is an amenable number.

12113231321 is a deficient number, since it is larger than the sum of its proper divisors (1306123).

12113231321 is an equidigital number, since it uses as much as digits as its factorization.

12113231321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306122.

The product of its digits is 216, while the sum is 20.

Adding to 12113231321 its reverse (12313231121), we get a palindrome (24426462442).

The spelling of 12113231321 in words is "twelve billion, one hundred thirteen million, two hundred thirty-one thousand, three hundred twenty-one".