12243105131221 has 2 divisors, whose sum is σ = 12243105131222. Its totient is φ = 12243105131220.

The previous prime is 12243105131189. The next prime is 12243105131351. The reversal of 12243105131221 is 12213150134221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11979289354321 + 263815776900 = 3461111^2 + 513630^2 .

It is a cyclic number.

It is not a de Polignac number, because 12243105131221 - 2⁵ = 12243105131189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12243105131221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12243105131021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6121552565610 + 6121552565611.

It is an arithmetic number, because the mean of its divisors is an integer number (6121552565611).

Almost surely, 2^{12243105131221} is an apocalyptic number.

It is an amenable number.

12243105131221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12243105131221 is an equidigital number, since it uses as much as digits as its factorization.

12243105131221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 12243105131221 its reverse (12213150134221), we get a palindrome (24456255265442).

The spelling of 12243105131221 in words is "twelve trillion, two hundred forty-three billion, one hundred five million, one hundred thirty-one thousand, two hundred twenty-one".