321897216 has 144 divisors (see below), whose sum is σ = 901404000. Its totient is φ = 101842944.

The previous prime is 321897203. The next prime is 321897229. The reversal of 321897216 is 612798123.

321897216 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (321897203) and next prime (321897229).

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, 2160310 + ... + 2160458.

It is an arithmetic number, because the mean of its divisors is an integer number (6259750).

Almost surely, 2^321897216 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 321897216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (450702000).

321897216 is an abundant number, since it is smaller than the sum of its proper divisors (579506784).

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

321897216 is a wasteful number, since it uses less digits than its factorization.

321897216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 280 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 321897216 is about 17941.4942521519. The cubic root of 321897216 is about 685.3394634075.

The spelling of 321897216 in words is "three hundred twenty-one million, eight hundred ninety-seven thousand, two hundred sixteen".