12331220322221 has 2 divisors, whose sum is σ = 12331220322222. Its totient is φ = 12331220322220.

The previous prime is 12331220322121. The next prime is 12331220322241. The reversal of 12331220322221 is 12222302213321.

12331220322221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12011700324100 + 319519998121 = 3465790^2 + 565261^2 .

It is a cyclic number.

It is not a de Polignac number, because 12331220322221 - 2¹⁰ = 12331220321197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12331220322241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6165610161110 + 6165610161111.

It is an arithmetic number, because the mean of its divisors is an integer number (6165610161111).

Almost surely, 2^{12331220322221} is an apocalyptic number.

It is an amenable number.

12331220322221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12331220322221 is an equidigital number, since it uses as much as digits as its factorization.

12331220322221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 12331220322221 its reverse (12222302213321), we get a palindrome (24553522535542).

The spelling of 12331220322221 in words is "twelve trillion, three hundred thirty-one billion, two hundred twenty million, three hundred twenty-two thousand, two hundred twenty-one".