12105203500321 has 2 divisors, whose sum is σ = 12105203500322. Its totient is φ = 12105203500320.

The previous prime is 12105203500217. The next prime is 12105203500349. The reversal of 12105203500321 is 12300530250121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10821369472225 + 1283834028096 = 3289585^2 + 1133064^2 .

It is a cyclic number.

It is not a de Polignac number, because 12105203500321 - 2¹¹ = 12105203498273 is a prime.

It is not a weakly prime, because it can be changed into another prime (12105203500361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6052601750160 + 6052601750161.

It is an arithmetic number, because the mean of its divisors is an integer number (6052601750161).

Almost surely, 2^{12105203500321} is an apocalyptic number.

It is an amenable number.

12105203500321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12105203500321 is an equidigital number, since it uses as much as digits as its factorization.

12105203500321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 12105203500321 its reverse (12300530250121), we get a palindrome (24405733750442).

The spelling of 12105203500321 in words is "twelve trillion, one hundred five billion, two hundred three million, five hundred thousand, three hundred twenty-one".