320121280000 has 200 divisors, whose sum is σ = 805661505792. Its totient is φ = 127024128000.

The previous prime is 320121279971. The next prime is 320121280091. The reversal of 320121280000 is 82121023.

It is a tau number, because it is divible by the number of its divisors (200).

It is a self number, because there is not a number n which added to its sum of digits gives 320121280000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 40636062 + ... + 40643938.

Almost surely, 2^320121280000 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 320121280000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (402830752896).

320121280000 is an abundant number, since it is smaller than the sum of its proper divisors (485540225792).

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

320121280000 is an frugal number, since it uses more digits than its factorization.

320121280000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8042 (or 8011 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The spelling of 320121280000 in words is "three hundred twenty billion, one hundred twenty-one million, two hundred eighty thousand".