521744245420 has 24 divisors (see below), whose sum is σ = 1096540200000. Its totient is φ = 208530596352.

The previous prime is 521744245403. The next prime is 521744245469. The reversal of 521744245420 is 24542447125.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10418260 + ... + 10468219.

It is an arithmetic number, because the mean of its divisors is an integer number (45689175000).

Almost surely, 2^521744245420 is an apocalyptic number.

It is an amenable number.

521744245420 is an abundant number, since it is smaller than the sum of its proper divisors (574795954580).

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

521744245420 is a wasteful number, since it uses less digits than its factorization.

521744245420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20887737 (or 20887735 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 40.

The spelling of 521744245420 in words is "five hundred twenty-one billion, seven hundred forty-four million, two hundred forty-five thousand, four hundred twenty".