2891217176321 has 2 divisors, whose sum is σ = 2891217176322. Its totient is φ = 2891217176320.

The previous prime is 2891217176317. The next prime is 2891217176347. The reversal of 2891217176321 is 1236717121982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1613268321025 + 1277948855296 = 1270145^2 + 1130464^2 .

It is a cyclic number.

It is not a de Polignac number, because 2891217176321 - 2² = 2891217176317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2891217176321.

It is not a weakly prime, because it can be changed into another prime (2891217176381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1445608588160 + 1445608588161.

It is an arithmetic number, because the mean of its divisors is an integer number (1445608588161).

Almost surely, 2^{2891217176321} is an apocalyptic number.

It is an amenable number.

2891217176321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891217176321 is an equidigital number, since it uses as much as digits as its factorization.

2891217176321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 50.

The spelling of 2891217176321 in words is "two trillion, eight hundred ninety-one billion, two hundred seventeen million, one hundred seventy-six thousand, three hundred twenty-one".