219841816321 has 2 divisors, whose sum is σ = 219841816322. Its totient is φ = 219841816320.

The previous prime is 219841816301. The next prime is 219841816331. The reversal of 219841816321 is 123618148912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114710238721 + 105131577600 = 338689^2 + 324240^2 .

It is a cyclic number.

It is not a de Polignac number, because 219841816321 - 2²³ = 219833427713 is a prime.

It is not a weakly prime, because it can be changed into another prime (219841816301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109920908160 + 109920908161.

It is an arithmetic number, because the mean of its divisors is an integer number (109920908161).

Almost surely, 2^219841816321 is an apocalyptic number.

It is an amenable number.

219841816321 is a deficient number, since it is larger than the sum of its proper divisors (1).

219841816321 is an equidigital number, since it uses as much as digits as its factorization.

219841816321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 46.

The spelling of 219841816321 in words is "two hundred nineteen billion, eight hundred forty-one million, eight hundred sixteen thousand, three hundred twenty-one".