321642432320 has 112 divisors (see below), whose sum is σ = 842445717696. Its totient is φ = 116960729600.

The previous prime is 321642432281. The next prime is 321642432379. The reversal of 321642432320 is 23234246123.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48335 + ... + 803505.

Almost surely, 2^321642432320 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 321642432320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (421222858848).

321642432320 is an abundant number, since it is smaller than the sum of its proper divisors (520803285376).

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

321642432320 is an equidigital number, since it uses as much as digits as its factorization.

321642432320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755221 (or 755189 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 32.

Adding to 321642432320 its reverse (23234246123), we get a palindrome (344876678443).

The spelling of 321642432320 in words is "three hundred twenty-one billion, six hundred forty-two million, four hundred thirty-two thousand, three hundred twenty".