321221330320 has 160 divisors (see below), whose sum is σ = 824362665984. Its totient is φ = 115433472000.

The previous prime is 321221330317. The next prime is 321221330351. The reversal of 321221330320 is 23033122123.

It is a super-4 number, since 4×321221330320⁴ (a number of 47 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 321221330291 and 321221330300.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35097745 + ... + 35106895.

Almost surely, 2^321221330320 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 321221330320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412181332992).

321221330320 is an abundant number, since it is smaller than the sum of its proper divisors (503141335664).

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

321221330320 is a wasteful number, since it uses less digits than its factorization.

321221330320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9641 (or 9635 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 321221330320 its reverse (23033122123), we get a palindrome (344254452443).

The spelling of 321221330320 in words is "three hundred twenty-one billion, two hundred twenty-one million, three hundred thirty thousand, three hundred twenty".