12051221306321 has 2 divisors, whose sum is σ = 12051221306322. Its totient is φ = 12051221306320.

The previous prime is 12051221306287. The next prime is 12051221306407. The reversal of 12051221306321 is 12360312215021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12048285292096 + 2936014225 = 3471064^2 + 54185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12051221306321 is a prime.

It is not a weakly prime, because it can be changed into another prime (12051221306921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6025610653160 + 6025610653161.

It is an arithmetic number, because the mean of its divisors is an integer number (6025610653161).

Almost surely, 2^{12051221306321} is an apocalyptic number.

It is an amenable number.

12051221306321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12051221306321 is an equidigital number, since it uses as much as digits as its factorization.

12051221306321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 12051221306321 in words is "twelve trillion, fifty-one billion, two hundred twenty-one million, three hundred six thousand, three hundred twenty-one".