9321231721440 has 576 divisors, whose sum is σ = 32248028510208. Its totient is φ = 2260380057600.

The previous prime is 9321231721397. The next prime is 9321231721469. The reversal of 9321231721440 is 441271321239.

It is a congruent number.

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 95 ways as a sum of consecutive naturals, for example, 3556363330 + ... + 3556365950.

It is an arithmetic number, because the mean of its divisors is an integer number (55986160608).

Almost surely, 2^{9321231721440} 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 9321231721440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16124014255104).

9321231721440 is an abundant number, since it is smaller than the sum of its proper divisors (22926796788768).

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

9321231721440 is a wasteful number, since it uses less digits than its factorization.

9321231721440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3531 (or 3506 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 9321231721440 in words is "nine trillion, three hundred twenty-one billion, two hundred thirty-one million, seven hundred twenty-one thousand, four hundred forty".