521231540228 has 72 divisors (see below), whose sum is σ = 1081045355544. Its totient is φ = 219198873600.

The previous prime is 521231540197. The next prime is 521231540267. The reversal of 521231540228 is 822045132125.

It can be written as a sum of positive squares in 4 ways, for example, as 186138747844 + 335092792384 = 431438^2 + 578872^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4981700 + ... + 5085252.

It is an arithmetic number, because the mean of its divisors is an integer number (15014518827).

Almost surely, 2^521231540228 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 521231540228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (540522677772).

521231540228 is an abundant number, since it is smaller than the sum of its proper divisors (559813815316).

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

521231540228 is a wasteful number, since it uses less digits than its factorization.

521231540228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104053 (or 104044 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

The spelling of 521231540228 in words is "five hundred twenty-one billion, two hundred thirty-one million, five hundred forty thousand, two hundred twenty-eight".