520213521 has 32 divisors (see below), whose sum is σ = 745390080. Its totient is φ = 321753600.

The previous prime is 520213487. The next prime is 520213543. The reversal of 520213521 is 125312025.

It is not a de Polignac number, because 520213521 - 2⁹ = 520213009 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (520213591) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 772641 + ... + 773313.

It is an arithmetic number, because the mean of its divisors is an integer number (23293440).

Almost surely, 2^520213521 is an apocalyptic number.

It is an amenable number.

520213521 is a deficient number, since it is larger than the sum of its proper divisors (225176559).

520213521 is a wasteful number, since it uses less digits than its factorization.

520213521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 520213521 is about 22808.1897791122. The cubic root of 520213521 is about 804.2552019621.

Adding to 520213521 its reverse (125312025), we get a palindrome (645525546).

The spelling of 520213521 in words is "five hundred twenty million, two hundred thirteen thousand, five hundred twenty-one".