8821999321440 has 192 divisors, whose sum is σ = 29253904323840. Its totient is φ = 2228562339840.

The previous prime is 8821999321403. The next prime is 8821999321489. The reversal of 8821999321440 is 441239991288.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195756510 + ... + 195801570.

It is an arithmetic number, because the mean of its divisors is an integer number (152364085020).

Almost surely, 2^{8821999321440} is an apocalyptic number.

8821999321440 is a gapful number since it is divisible by the number (80) 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 8821999321440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14626952161920).

8821999321440 is an abundant number, since it is smaller than the sum of its proper divisors (20431905002400).

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

8821999321440 is a wasteful number, since it uses less digits than its factorization.

8821999321440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66565 (or 66557 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 60.

The spelling of 8821999321440 in words is "eight trillion, eight hundred twenty-one billion, nine hundred ninety-nine million, three hundred twenty-one thousand, four hundred forty".