9871421560320 has 240 divisors, whose sum is σ = 32346216294480. Its totient is φ = 2568171356160.

The previous prime is 9871421560291. The next prime is 9871421560321. The reversal of 9871421560320 is 230651241789.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 9871421560320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9871421560321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12527766 + ... + 13292394.

It is an arithmetic number, because the mean of its divisors is an integer number (134775901227).

It is a 1-persistent number, because it is pandigital, but 2⋅9871421560320 = 19742843120640 is not.

Almost surely, 2^{9871421560320} 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 9871421560320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16173108147240).

9871421560320 is an abundant number, since it is smaller than the sum of its proper divisors (22474794734160).

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

9871421560320 is an equidigital number, since it uses as much as digits as its factorization.

9871421560320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764737 (or 764680 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 9871421560320 in words is "nine trillion, eight hundred seventy-one billion, four hundred twenty-one million, five hundred sixty thousand, three hundred twenty".