321397216 has 48 divisors (see below), whose sum is σ = 754596864. Its totient is φ = 131750784.

The previous prime is 321397213. The next prime is 321397259. The reversal of 321397216 is 612793123.

321397216 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321397211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26040 + ... + 36343.

It is an arithmetic number, because the mean of its divisors is an integer number (15720768).

Almost surely, 2^321397216 is an apocalyptic number.

It is an amenable number.

321397216 is an abundant number, since it is smaller than the sum of its proper divisors (433199648).

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

321397216 is a wasteful number, since it uses less digits than its factorization.

321397216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62423 (or 62415 counting only the distinct ones).

The product of its digits is 13608, while the sum is 34.

The square root of 321397216 is about 17927.5546575655. The cubic root of 321397216 is about 684.9844356845.

The spelling of 321397216 in words is "three hundred twenty-one million, three hundred ninety-seven thousand, two hundred sixteen".