2160865556321 has 2 divisors, whose sum is σ = 2160865556322. Its totient is φ = 2160865556320.

The previous prime is 2160865556231. The next prime is 2160865556323. The reversal of 2160865556321 is 1236555680612.

Together with previous prime (2160865556231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2062670440000 + 98195116321 = 1436200^2 + 313361^2 .

It is a cyclic number.

It is not a de Polignac number, because 2160865556321 - 2¹⁰ = 2160865555297 is a prime.

Together with 2160865556323, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2160865556321.

It is not a weakly prime, because it can be changed into another prime (2160865556323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080432778160 + 1080432778161.

It is an arithmetic number, because the mean of its divisors is an integer number (1080432778161).

Almost surely, 2^{2160865556321} is an apocalyptic number.

It is an amenable number.

2160865556321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2160865556321 is an equidigital number, since it uses as much as digits as its factorization.

2160865556321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592000, while the sum is 50.

The spelling of 2160865556321 in words is "two trillion, one hundred sixty billion, eight hundred sixty-five million, five hundred fifty-six thousand, three hundred twenty-one".