12103021211221 has 2 divisors, whose sum is σ = 12103021211222. Its totient is φ = 12103021211220.

The previous prime is 12103021211189. The next prime is 12103021211227. The reversal of 12103021211221 is 12211212030121.

12103021211221 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., 11912065320996 + 190955890225 = 3451386^2 + 436985^2 .

It is a cyclic number.

It is not a de Polignac number, because 12103021211221 - 2⁵ = 12103021211189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12103021211227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6051510605610 + 6051510605611.

It is an arithmetic number, because the mean of its divisors is an integer number (6051510605611).

Almost surely, 2^{12103021211221} is an apocalyptic number.

It is an amenable number.

12103021211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12103021211221 is an equidigital number, since it uses as much as digits as its factorization.

12103021211221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 12103021211221 its reverse (12211212030121), we get a palindrome (24314233241342).

The spelling of 12103021211221 in words is "twelve trillion, one hundred three billion, twenty-one million, two hundred eleven thousand, two hundred twenty-one".