321516315727331 has 8 divisors (see below), whose sum is σ = 337287635733600. Its totient is φ = 306057299087680.

The previous prime is 321516315727261. The next prime is 321516315727357. The reversal of 321516315727331 is 133727513615123.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321516315727331 is a prime.

It is a super-2 number, since 2×321516315727331² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 321516315727331.

It is not an unprimeable number, because it can be changed into a prime (321516315727031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78075839546 + ... + 78075843663.

It is an arithmetic number, because the mean of its divisors is an integer number (42160954466700).

Almost surely, 2^{321516315727331} is an apocalyptic number.

321516315727331 is a deficient number, since it is larger than the sum of its proper divisors (15771320006269).

321516315727331 is a wasteful number, since it uses less digits than its factorization.

321516315727331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156151683309.

The product of its digits is 2381400, while the sum is 50.

The spelling of 321516315727331 in words is "three hundred twenty-one trillion, five hundred sixteen billion, three hundred fifteen million, seven hundred twenty-seven thousand, three hundred thirty-one".