321121310999 has 4 divisors (see below), whose sum is σ = 321968597160. Its totient is φ = 320274024840.

The previous prime is 321121310981. The next prime is 321121311047. The reversal of 321121310999 is 999013121123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999013121123 = 44543 ⋅22428061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321121310999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321121312999) 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 in 3 ways as a sum of consecutive naturals, for example, 423642512 + ... + 423643269.

It is an arithmetic number, because the mean of its divisors is an integer number (80492149290).

Almost surely, 2^321121310999 is an apocalyptic number.

321121310999 is a deficient number, since it is larger than the sum of its proper divisors (847286161).

321121310999 is an equidigital number, since it uses as much as digits as its factorization.

321121310999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847286160.

The product of its (nonzero) digits is 26244, while the sum is 41.

The spelling of 321121310999 in words is "three hundred twenty-one billion, one hundred twenty-one million, three hundred ten thousand, nine hundred ninety-nine".