521243235044004 has 24 divisors (see below), whose sum is σ = 1326800961930528. Its totient is φ = 157952495467840.

The previous prime is 521243235043931. The next prime is 521243235044009. The reversal of 521243235044004 is 400440532342125.

It is not an unprimeable number, because it can be changed into a prime (521243235044009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1974406193217 + ... + 1974406193480.

It is an arithmetic number, because the mean of its divisors is an integer number (55283373413772).

Almost surely, 2^{521243235044004} is an apocalyptic number.

It is an amenable number.

521243235044004 is an abundant number, since it is smaller than the sum of its proper divisors (805557726886524).

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

521243235044004 is a wasteful number, since it uses less digits than its factorization.

521243235044004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3948812386715 (or 3948812386713 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 39.

Adding to 521243235044004 its reverse (400440532342125), we get a palindrome (921683767386129).

The spelling of 521243235044004 in words is "five hundred twenty-one trillion, two hundred forty-three billion, two hundred thirty-five million, forty-four thousand, four".