321644375009320 has 384 divisors, whose sum is σ = 843610444300800. Its totient is φ = 109154654784000.

The previous prime is 321644375009297. The next prime is 321644375009341. The reversal of 321644375009320 is 23900573446123.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 68566268175 + ... + 68566272865.

It is an arithmetic number, because the mean of its divisors is an integer number (2196902198700).

Almost surely, 2^{321644375009320} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321644375009320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (421805222150400).

321644375009320 is an abundant number, since it is smaller than the sum of its proper divisors (521966069291480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321644375009320 is a wasteful number, since it uses less digits than its factorization.

321644375009320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6501 (or 6426 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 49.

The spelling of 321644375009320 in words is "three hundred twenty-one trillion, six hundred forty-four billion, three hundred seventy-five million, nine thousand, three hundred twenty".