321136304 has 40 divisors (see below), whose sum is σ = 650717280. Its totient is φ = 153241088.

The previous prime is 321136301. The next prime is 321136331. The reversal of 321136304 is 403631123.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 321136304.

It is not an unprimeable number, because it can be changed into a prime (321136301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248492 + ... + 249780.

It is an arithmetic number, because the mean of its divisors is an integer number (16267932).

Almost surely, 2^321136304 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 321136304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (325358640).

321136304 is an abundant number, since it is smaller than the sum of its proper divisors (329580976).

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

321136304 is a wasteful number, since it uses less digits than its factorization.

321136304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997 (or 1991 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 321136304 is about 17920.2763371551. The cubic root of 321136304 is about 684.7990274792.

Adding to 321136304 its reverse (403631123), we get a palindrome (724767427).

The spelling of 321136304 in words is "three hundred twenty-one million, one hundred thirty-six thousand, three hundred four".