321403212 has 72 divisors (see below), whose sum is σ = 878173296. Its totient is φ = 98527104.

The previous prime is 321403189. The next prime is 321403253. The reversal of 321403212 is 212304123.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142558 + ... + 144794.

Almost surely, 2^321403212 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 321403212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (439086648).

321403212 is an abundant number, since it is smaller than the sum of its proper divisors (556770084).

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

321403212 is a wasteful number, since it uses less digits than its factorization.

321403212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2567 (or 2562 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 321403212 is about 17927.7218853930. The cubic root of 321403212 is about 684.9886953575.

Adding to 321403212 its reverse (212304123), we get a palindrome (533707335).

The spelling of 321403212 in words is "three hundred twenty-one million, four hundred three thousand, two hundred twelve".