521322531012 has 144 divisors (see below), whose sum is σ = 1471368749760. Its totient is φ = 154667003904.

The previous prime is 521322531011. The next prime is 521322531053. The reversal of 521322531012 is 210135223125.

521322531012 is a `hidden beast` number, since 5 + 21 + 322 + 5 + 310 + 1 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (521322531011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6506748 + ... + 6586380.

It is an arithmetic number, because the mean of its divisors is an integer number (10217838540).

Almost surely, 2^521322531012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521322531012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (735684374880).

521322531012 is an abundant number, since it is smaller than the sum of its proper divisors (950046218748).

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

521322531012 is a wasteful number, since it uses less digits than its factorization.

521322531012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80242 (or 80237 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 521322531012 its reverse (210135223125), we get a palindrome (731457754137).

The spelling of 521322531012 in words is "five hundred twenty-one billion, three hundred twenty-two million, five hundred thirty-one thousand, twelve".