521313231522 has 32 divisors (see below), whose sum is σ = 1047084058944. Its totient is φ = 173028326400.

The previous prime is 521313231521. The next prime is 521313231589. The reversal of 521313231522 is 225132313125.

It is a self number, because there is not a number n which added to its sum of digits gives 521313231522.

It is not an unprimeable number, because it can be changed into a prime (521313231521) 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, 14921178 + ... + 14956074.

It is an arithmetic number, because the mean of its divisors is an integer number (32721376842).

Almost surely, 2^521313231522 is an apocalyptic number.

521313231522 is an abundant number, since it is smaller than the sum of its proper divisors (525770827422).

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

521313231522 is a wasteful number, since it uses less digits than its factorization.

521313231522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45474.

The product of its digits is 10800, while the sum is 30.

Adding to 521313231522 its reverse (225132313125), we get a palindrome (746445544647).

The spelling of 521313231522 in words is "five hundred twenty-one billion, three hundred thirteen million, two hundred thirty-one thousand, five hundred twenty-two".