9321720408000 has 3360 divisors, whose sum is σ = 47151798902208. Its totient is φ = 1787111424000.

The previous prime is 9321720407983. The next prime is 9321720408029. The reversal of 9321720408000 is 8040271239.

It is a tau number, because it is divible by the number of its divisors (3360).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 479 ways as a sum of consecutive naturals, for example, 4540534974 + ... + 4540537026.

Almost surely, 2^{9321720408000} is an apocalyptic number.

9321720408000 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9321720408000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23575899451104).

9321720408000 is an abundant number, since it is smaller than the sum of its proper divisors (37830078494208).

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

9321720408000 is a wasteful number, since it uses less digits than its factorization.

9321720408000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130 (or 2094 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

Adding to 9321720408000 its reverse (8040271239), we get a palindrome (9329760679239).

The spelling of 9321720408000 in words is "nine trillion, three hundred twenty-one billion, seven hundred twenty million, four hundred eight thousand".