321112211100991 has 2 divisors, whose sum is σ = 321112211100992. Its totient is φ = 321112211100990.

The previous prime is 321112211100931. The next prime is 321112211101079. The reversal of 321112211100991 is 199001112211123.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (199001112211123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321112211100991 - 2³³ = 321103621166399 is a prime.

It is a super-2 number, since 2×321112211100991² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321112211100931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160556105550495 + 160556105550496.

It is an arithmetic number, because the mean of its divisors is an integer number (160556105550496).

Almost surely, 2^{321112211100991} is an apocalyptic number.

321112211100991 is a deficient number, since it is larger than the sum of its proper divisors (1).

321112211100991 is an equidigital number, since it uses as much as digits as its factorization.

321112211100991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 34.

The spelling of 321112211100991 in words is "three hundred twenty-one trillion, one hundred twelve billion, two hundred eleven million, one hundred thousand, nine hundred ninety-one".