1320873984217 has 2 divisors, whose sum is σ = 1320873984218. Its totient is φ = 1320873984216.

The previous prime is 1320873984211. The next prime is 1320873984247. The reversal of 1320873984217 is 7124893780231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1320267642841 + 606341376 = 1149029^2 + 24624^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320873984217 - 2¹⁹ = 1320873459929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320873984211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660436992108 + 660436992109.

It is an arithmetic number, because the mean of its divisors is an integer number (660436992109).

Almost surely, 2^{1320873984217} is an apocalyptic number.

It is an amenable number.

1320873984217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320873984217 is an equidigital number, since it uses as much as digits as its factorization.

1320873984217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 1320873984217 in words is "one trillion, three hundred twenty billion, eight hundred seventy-three million, nine hundred eighty-four thousand, two hundred seventeen".