521321313 has 8 divisors (see below), whose sum is σ = 719064000. Its totient is φ = 335563088.

The previous prime is 521321267. The next prime is 521321323. The reversal of 521321313 is 313123125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521321313 - 2¹⁴ = 521304929 is a prime.

It is a super-2 number, since 2×521321313² = 543551822776087938, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 521321313.

It is not an unprimeable number, because it can be changed into a prime (521321323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2996013 + ... + 2996186.

It is an arithmetic number, because the mean of its divisors is an integer number (89883000).

Almost surely, 2^521321313 is an apocalyptic number.

It is an amenable number.

521321313 is a deficient number, since it is larger than the sum of its proper divisors (197742687).

521321313 is a wasteful number, since it uses less digits than its factorization.

521321313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5992231.

The product of its digits is 540, while the sum is 21.

The square root of 521321313 is about 22832.4618252172. The cubic root of 521321313 is about 804.8256829711.

Adding to 521321313 its reverse (313123125), we get a palindrome (834444438).

The spelling of 521321313 in words is "five hundred twenty-one million, three hundred twenty-one thousand, three hundred thirteen".