321135056 has 80 divisors (see below), whose sum is σ = 699062400. Its totient is φ = 141672960.

The previous prime is 321135029. The next prime is 321135119. The reversal of 321135056 is 650531123.

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, 1613645 + ... + 1613843.

It is an arithmetic number, because the mean of its divisors is an integer number (8738280).

Almost surely, 2^321135056 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 321135056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349531200).

321135056 is an abundant number, since it is smaller than the sum of its proper divisors (377927344).

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

321135056 is a wasteful number, since it uses less digits than its factorization.

321135056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444 (or 438 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 321135056 is about 17920.2415162296. The cubic root of 321135056 is about 684.7981403893.

Adding to 321135056 its reverse (650531123), we get a palindrome (971666179).

The spelling of 321135056 in words is "three hundred twenty-one million, one hundred thirty-five thousand, fifty-six".