521103541021 has 16 divisors (see below), whose sum is σ = 627653324800. Its totient is φ = 422637501168.

The previous prime is 521103540989. The next prime is 521103541033. The reversal of 521103541021 is 120145301125.

It is a cyclic number.

It is not a de Polignac number, because 521103541021 - 2⁵ = 521103540989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521100541021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2270901 + ... + 2489818.

It is an arithmetic number, because the mean of its divisors is an integer number (39228332800).

Almost surely, 2^521103541021 is an apocalyptic number.

It is an amenable number.

521103541021 is a deficient number, since it is larger than the sum of its proper divisors (106549783779).

521103541021 is a wasteful number, since it uses less digits than its factorization.

521103541021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4761568.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 521103541021 its reverse (120145301125), we get a palindrome (641248842146).

The spelling of 521103541021 in words is "five hundred twenty-one billion, one hundred three million, five hundred forty-one thousand, twenty-one".