521540122404 has 96 divisors (see below), whose sum is σ = 1418857171200. Its totient is φ = 146009829888.

The previous prime is 521540122333. The next prime is 521540122429. The reversal of 521540122404 is 404221045125.

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, 3365622 + ... + 3517170.

It is an arithmetic number, because the mean of its divisors is an integer number (14779762200).

Almost surely, 2^521540122404 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 521540122404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (709428585600).

521540122404 is an abundant number, since it is smaller than the sum of its proper divisors (897317048796).

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

521540122404 is a wasteful number, since it uses less digits than its factorization.

521540122404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152389 (or 152387 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 521540122404 its reverse (404221045125), we get a palindrome (925761167529).

The spelling of 521540122404 in words is "five hundred twenty-one billion, five hundred forty million, one hundred twenty-two thousand, four hundred four".