921903384964 has 27 divisors (see below), whose sum is σ = 1686606324613. Its totient is φ = 440889191072.

The previous prime is 921903384901. The next prime is 921903384971. The reversal of 921903384964 is 469483309129.

The square root of 921903384964 is 960158.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 299395008900 + 622508376064 = 547170^2 + 788992^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 921903384899 and 921903384908.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 44156832 + ... + 44177704.

Almost surely, 2^921903384964 is an apocalyptic number.

921903384964 is the 960158-th square number.

It is an amenable number.

921903384964 is a deficient number, since it is larger than the sum of its proper divisors (764702939649).

921903384964 is an frugal number, since it uses more digits than its factorization.

921903384964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41796 (or 20898 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 58.

The spelling of 921903384964 in words is "nine hundred twenty-one billion, nine hundred three million, three hundred eighty-four thousand, nine hundred sixty-four".