521415244240 has 160 divisors (see below), whose sum is σ = 1334929559040. Its totient is φ = 187828492800.

The previous prime is 521415244223. The next prime is 521415244243. The reversal of 521415244240 is 42442514125.

It is a junction number, because it is equal to n+sod(n) for n = 521415244196 and 521415244205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521415244243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71354667 + ... + 71361973.

It is an arithmetic number, because the mean of its divisors is an integer number (8343309744).

Almost surely, 2^521415244240 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 521415244240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (667464779520).

521415244240 is an abundant number, since it is smaller than the sum of its proper divisors (813514314800).

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

521415244240 is a wasteful number, since it uses less digits than its factorization.

521415244240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8081 (or 8075 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 34.

Adding to 521415244240 its reverse (42442514125), we get a palindrome (563857758365).

The spelling of 521415244240 in words is "five hundred twenty-one billion, four hundred fifteen million, two hundred forty-four thousand, two hundred forty".