521243320511420 has 48 divisors (see below), whose sum is σ = 1178934322224960. Its totient is φ = 192439071361536.

The previous prime is 521243320511371. The next prime is 521243320511521. The reversal of 521243320511420 is 24115023342125.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101664185 + ... + 106668144.

It is an arithmetic number, because the mean of its divisors is an integer number (24561131713020).

Almost surely, 2^{521243320511420} is an apocalyptic number.

It is an amenable number.

521243320511420 is an abundant number, since it is smaller than the sum of its proper divisors (657691001713540).

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

521243320511420 is a wasteful number, since it uses less digits than its factorization.

521243320511420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208341974 (or 208341972 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 521243320511420 its reverse (24115023342125), we get a palindrome (545358343853545).

The spelling of 521243320511420 in words is "five hundred twenty-one trillion, two hundred forty-three billion, three hundred twenty million, five hundred eleven thousand, four hundred twenty".