12311103221 has 2 divisors, whose sum is σ = 12311103222. Its totient is φ = 12311103220.

The previous prime is 12311103151. The next prime is 12311103239. The reversal of 12311103221 is 12230111321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6623680996 + 5687422225 = 81386^2 + 75415^2 .

It is a cyclic number.

It is not a de Polignac number, because 12311103221 - 2²² = 12306908917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12311103221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12311103821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6155551610 + 6155551611.

It is an arithmetic number, because the mean of its divisors is an integer number (6155551611).

Almost surely, 2^12311103221 is an apocalyptic number.

It is an amenable number.

12311103221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12311103221 is an equidigital number, since it uses as much as digits as its factorization.

12311103221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 12311103221 its reverse (12230111321), we get a palindrome (24541214542).

The spelling of 12311103221 in words is "twelve billion, three hundred eleven million, one hundred three thousand, two hundred twenty-one".