521104320 has 224 divisors, whose sum is σ = 2005827840. Its totient is φ = 126305280.

The previous prime is 521104319. The next prime is 521104351. The reversal of 521104320 is 23401125.

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

It is a junction number, because it is equal to n+sod(n) for n = 521104293 and 521104302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92299 + ... + 97781.

Almost surely, 2^521104320 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 521104320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1002913920).

521104320 is an abundant number, since it is smaller than the sum of its proper divisors (1484723520).

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

521104320 is a wasteful number, since it uses less digits than its factorization.

521104320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5520 (or 5504 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 521104320 is about 22827.7094777378. The cubic root of 521104320 is about 804.7140015113.

Adding to 521104320 its reverse (23401125), we get a palindrome (544505445).

The spelling of 521104320 in words is "five hundred twenty-one million, one hundred four thousand, three hundred twenty".