521232340440 has 128 divisors (see below), whose sum is σ = 1788288399360. Its totient is φ = 119058415104.

The previous prime is 521232340381. The next prime is 521232340469. The reversal of 521232340440 is 44043232125.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 521232340398 and 521232340407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1040434 + ... + 1457726.

It is an arithmetic number, because the mean of its divisors is an integer number (13971003120).

Almost surely, 2^521232340440 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 521232340440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (894144199680).

521232340440 is an abundant number, since it is smaller than the sum of its proper divisors (1267056058920).

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

521232340440 is a wasteful number, since it uses less digits than its factorization.

521232340440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418801 (or 418797 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 521232340440 its reverse (44043232125), we get a palindrome (565275572565).

The spelling of 521232340440 in words is "five hundred twenty-one billion, two hundred thirty-two million, three hundred forty thousand, four hundred forty".