821144328416 has 24 divisors (see below), whose sum is σ = 1616711849424. Its totient is φ = 410550842880.

The previous prime is 821144328397. The next prime is 821144328419. The reversal of 821144328416 is 614823441128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821144328419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31145 + ... + 1281896.

It is an arithmetic number, because the mean of its divisors is an integer number (67362993726).

Almost surely, 2^821144328416 is an apocalyptic number.

It is an amenable number.

821144328416 is a deficient number, since it is larger than the sum of its proper divisors (795567521008).

821144328416 is a wasteful number, since it uses less digits than its factorization.

821144328416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332594 (or 1332586 counting only the distinct ones).

The product of its digits is 294912, while the sum is 44.

The spelling of 821144328416 in words is "eight hundred twenty-one billion, one hundred forty-four million, three hundred twenty-eight thousand, four hundred sixteen".