321921984 has 112 divisors (see below), whose sum is σ = 895380480. Its totient is φ = 101882880.

The previous prime is 321921983. The next prime is 321921991. The reversal of 321921984 is 489129123.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321921983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1187769 + ... + 1188039.

Almost surely, 2^321921984 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 321921984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (447690240).

321921984 is an abundant number, since it is smaller than the sum of its proper divisors (573458496).

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

321921984 is a wasteful number, since it uses less digits than its factorization.

321921984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578 (or 568 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 321921984 is about 17942.1844823868. The cubic root of 321921984 is about 685.3570405011.

The spelling of 321921984 in words is "three hundred twenty-one million, nine hundred twenty-one thousand, nine hundred eighty-four".