12311340221 has 2 divisors, whose sum is σ = 12311340222. Its totient is φ = 12311340220.

The previous prime is 12311340199. The next prime is 12311340241. The reversal of 12311340221 is 12204311321.

It is an a-pointer prime, because the next prime (12311340241) can be obtained adding 12311340221 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11106208996 + 1205131225 = 105386^2 + 34715^2 .

It is a cyclic number.

It is not a de Polignac number, because 12311340221 - 2¹⁰ = 12311339197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12311340193 and 12311340202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12311340241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6155670110 + 6155670111.

It is an arithmetic number, because the mean of its divisors is an integer number (6155670111).

Almost surely, 2^12311340221 is an apocalyptic number.

It is an amenable number.

12311340221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12311340221 is an equidigital number, since it uses as much as digits as its factorization.

12311340221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 12311340221 its reverse (12204311321), we get a palindrome (24515651542).

The spelling of 12311340221 in words is "twelve billion, three hundred eleven million, three hundred forty thousand, two hundred twenty-one".