321515000000 has 112 divisors (see below), whose sum is σ = 797518270848. Its totient is φ = 128604000000.

The previous prime is 321514999853. The next prime is 321515000011. The reversal of 321515000000 is 515123.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4967849 + ... + 5032151.

Almost surely, 2^321515000000 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 321515000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398759135424).

321515000000 is an abundant number, since it is smaller than the sum of its proper divisors (476003270848).

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

321515000000 is an frugal number, since it uses more digits than its factorization.

321515000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64350 (or 64310 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

Adding to 321515000000 its reverse (515123), we get a palindrome (321515515123).

The spelling of 321515000000 in words is "three hundred twenty-one billion, five hundred fifteen million", and thus it is an aban number.