921920271984 has 30 divisors (see below), whose sum is σ = 2580096317136. Its totient is φ = 307306757280.

The previous prime is 921920271967. The next prime is 921920272043. The reversal of 921920271984 is 489172029129.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 921920271984.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3201111912 + ... + 3201112199.

Almost surely, 2^921920271984 is an apocalyptic number.

It is an amenable number.

921920271984 is an abundant number, since it is smaller than the sum of its proper divisors (1658176045152).

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

921920271984 is a wasteful number, since it uses less digits than its factorization.

921920271984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6402224125 (or 6402224116 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 921920271984 in words is "nine hundred twenty-one billion, nine hundred twenty million, two hundred seventy-one thousand, nine hundred eighty-four".