921173980512 has 192 divisors, whose sum is σ = 2588976359424. Its totient is φ = 285769728000.

The previous prime is 921173980499. The next prime is 921173980537. The reversal of 921173980512 is 215089371129.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

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 31 ways as a sum of consecutive naturals, for example, 126236448 + ... + 126243744.

It is an arithmetic number, because the mean of its divisors is an integer number (13484251872).

Almost surely, 2^921173980512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 921173980512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1294488179712).

921173980512 is an abundant number, since it is smaller than the sum of its proper divisors (1667802378912).

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

921173980512 is a wasteful number, since it uses less digits than its factorization.

921173980512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8181 (or 8173 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 48.

The spelling of 921173980512 in words is "nine hundred twenty-one billion, one hundred seventy-three million, nine hundred eighty thousand, five hundred twelve".