521320332 has 48 divisors (see below), whose sum is σ = 1315795040. Its totient is φ = 159694848.

The previous prime is 521320321. The next prime is 521320339. The reversal of 521320332 is 233023125.

It is a junction number, because it is equal to n+sod(n) for n = 521320299 and 521320308.

It is not an unprimeable number, because it can be changed into a prime (521320339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28428 + ... + 43020.

Almost surely, 2^521320332 is an apocalyptic number.

521320332 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521320332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (657897520).

521320332 is an abundant number, since it is smaller than the sum of its proper divisors (794474708).

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

521320332 is a wasteful number, since it uses less digits than its factorization.

521320332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14842 (or 14840 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 521320332 is about 22832.4403426353. The cubic root of 521320332 is about 804.8251781420.

Adding to 521320332 its reverse (233023125), we get a palindrome (754343457).

The spelling of 521320332 in words is "five hundred twenty-one million, three hundred twenty thousand, three hundred thirty-two".