521342443240 has 32 divisors (see below), whose sum is σ = 1234758420000. Its totient is φ = 197561346624.

The previous prime is 521342443157. The next prime is 521342443267. The reversal of 521342443240 is 42344243125.

It is a junction number, because it is equal to n+sod(n) for n = 521342443196 and 521342443205.

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, 342987690 + ... + 342989209.

It is an arithmetic number, because the mean of its divisors is an integer number (38586200625).

Almost surely, 2^521342443240 is an apocalyptic number.

It is an amenable number.

521342443240 is an abundant number, since it is smaller than the sum of its proper divisors (713415976760).

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

521342443240 is a wasteful number, since it uses less digits than its factorization.

521342443240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685976929 (or 685976925 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 34.

Adding to 521342443240 its reverse (42344243125), we get a palindrome (563686686365).

The spelling of 521342443240 in words is "five hundred twenty-one billion, three hundred forty-two million, four hundred forty-three thousand, two hundred forty".