521231320 has 16 divisors (see below), whose sum is σ = 1172770560. Its totient is φ = 208492512.

The previous prime is 521231299. The next prime is 521231323. The reversal of 521231320 is 23132125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521231323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6515352 + ... + 6515431.

It is an arithmetic number, because the mean of its divisors is an integer number (73298160).

Almost surely, 2^521231320 is an apocalyptic number.

It is an amenable number.

521231320 is an abundant number, since it is smaller than the sum of its proper divisors (651539240).

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

521231320 is a wasteful number, since it uses less digits than its factorization.

521231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13030794 (or 13030790 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 521231320 is about 22830.4910153067. The cubic root of 521231320 is about 804.7793693420.

Adding to 521231320 its reverse (23132125), we get a palindrome (544363445).

The spelling of 521231320 in words is "five hundred twenty-one million, two hundred thirty-one thousand, three hundred twenty".