321103309987 has 2 divisors, whose sum is σ = 321103309988. Its totient is φ = 321103309986.

The previous prime is 321103309963. The next prime is 321103310023. The reversal of 321103309987 is 789903301123.

It is a weak prime.

It is an emirp because it is prime and its reverse (789903301123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321103309987 - 2²⁷ = 320969092259 is a prime.

It is not a weakly prime, because it can be changed into another prime (321103309957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160551654993 + 160551654994.

It is an arithmetic number, because the mean of its divisors is an integer number (160551654994).

Almost surely, 2^321103309987 is an apocalyptic number.

321103309987 is a deficient number, since it is larger than the sum of its proper divisors (1).

321103309987 is an equidigital number, since it uses as much as digits as its factorization.

321103309987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 321103309987 in words is "three hundred twenty-one billion, one hundred three million, three hundred nine thousand, nine hundred eighty-seven".