521453004240 has 320 divisors, whose sum is σ = 1945629757440. Its totient is φ = 112860241920.

The previous prime is 521453004239. The next prime is 521453004251. The reversal of 521453004240 is 42400354125.

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 = 521453004198 and 521453004207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 124837032 + ... + 124841208.

It is an arithmetic number, because the mean of its divisors is an integer number (6080092992).

Almost surely, 2^521453004240 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 521453004240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (972814878720).

521453004240 is an abundant number, since it is smaller than the sum of its proper divisors (1424176753200).

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

521453004240 is a wasteful number, since it uses less digits than its factorization.

521453004240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8130 (or 8124 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 521453004240 its reverse (42400354125), we get a palindrome (563853358365).

The spelling of 521453004240 in words is "five hundred twenty-one billion, four hundred fifty-three million, four thousand, two hundred forty".