12311012221 has 2 divisors, whose sum is σ = 12311012222. Its totient is φ = 12311012220.

The previous prime is 12311012201. The next prime is 12311012239. The reversal of 12311012221 is 12221011321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12311012025 + 196 = 110955^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 12311012221 - 2⁷ = 12311012093 is a prime.

It is a super-2 number, since 2×12311012221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12311012195 and 12311012204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12311012201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6155506110 + 6155506111.

It is an arithmetic number, because the mean of its divisors is an integer number (6155506111).

Almost surely, 2^12311012221 is an apocalyptic number.

It is an amenable number.

12311012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12311012221 is an equidigital number, since it uses as much as digits as its factorization.

12311012221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12311012221 its reverse (12221011321), we get a palindrome (24532023542).

The spelling of 12311012221 in words is "twelve billion, three hundred eleven million, twelve thousand, two hundred twenty-one".