321023021312 has 144 divisors (see below), whose sum is σ = 775946812032. Its totient is φ = 129399029760.

The previous prime is 321023021287. The next prime is 321023021359. The reversal of 321023021312 is 213120320123.

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, 61016762 + ... + 61022022.

It is an arithmetic number, because the mean of its divisors is an integer number (5388519528).

Almost surely, 2^321023021312 is an apocalyptic number.

321023021312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321023021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (387973406016).

321023021312 is an abundant number, since it is smaller than the sum of its proper divisors (454923790720).

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

321023021312 is a wasteful number, since it uses less digits than its factorization.

321023021312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7304 (or 7290 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 321023021312 its reverse (213120320123), we get a palindrome (534143341435).

The spelling of 321023021312 in words is "three hundred twenty-one billion, twenty-three million, twenty-one thousand, three hundred twelve".