421533664013 has 24 divisors (see below), whose sum is σ = 535002556320. Its totient is φ = 328425239520.

The previous prime is 421533664009. The next prime is 421533664037. The reversal of 421533664013 is 310466335124.

It is not a de Polignac number, because 421533664013 - 2² = 421533664009 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 (421533664073) 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 23 ways as a sum of consecutive naturals, for example, 4491395 + ... + 4584287.

It is an arithmetic number, because the mean of its divisors is an integer number (22291773180).

Almost surely, 2^421533664013 is an apocalyptic number.

It is an amenable number.

421533664013 is a deficient number, since it is larger than the sum of its proper divisors (113468892307).

421533664013 is a wasteful number, since it uses less digits than its factorization.

421533664013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101337 (or 101330 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

Adding to 421533664013 its reverse (310466335124), we get a palindrome (731999999137).

The spelling of 421533664013 in words is "four hundred twenty-one billion, five hundred thirty-three million, six hundred sixty-four thousand, thirteen".