921321996 has 96 divisors (see below), whose sum is σ = 2564835840. Its totient is φ = 251833344.

The previous prime is 921321991. The next prime is 921321997. The reversal of 921321996 is 699123129.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (921321991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 273595 + ... + 276941.

It is an arithmetic number, because the mean of its divisors is an integer number (26717040).

Almost surely, 2^921321996 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 921321996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1282417920).

921321996 is an abundant number, since it is smaller than the sum of its proper divisors (1643513844).

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

921321996 is a wasteful number, since it uses less digits than its factorization.

921321996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503 (or 3501 counting only the distinct ones).

The product of its digits is 52488, while the sum is 42.

The square root of 921321996 is about 30353.2864118533. The cubic root of 921321996 is about 973.0544578026.

The spelling of 921321996 in words is "nine hundred twenty-one million, three hundred twenty-one thousand, nine hundred ninety-six".