521020400120013 has 8 divisors (see below), whose sum is σ = 735558211934208. Its totient is φ = 326914760859584.

The previous prime is 521020400119987. The next prime is 521020400120029. The reversal of 521020400120013 is 310021004020125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521020400120013 - 2⁴⁰ = 519920888492237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521020400120053) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5108043138381 + ... + 5108043138482.

It is an arithmetic number, because the mean of its divisors is an integer number (91944776491776).

Almost surely, 2^{521020400120013} is an apocalyptic number.

It is an amenable number.

521020400120013 is a deficient number, since it is larger than the sum of its proper divisors (214537811814195).

521020400120013 is a wasteful number, since it uses less digits than its factorization.

521020400120013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10216086276883.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 521020400120013 its reverse (310021004020125), we get a palindrome (831041404140138).

The spelling of 521020400120013 in words is "five hundred twenty-one trillion, twenty billion, four hundred million, one hundred twenty thousand, thirteen".