9921387214560 has 96 divisors (see below), whose sum is σ = 31253224131360. Its totient is φ = 2645630926848.

The previous prime is 9921387214447. The next prime is 9921387214573. The reversal of 9921387214560 is 654127831299.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×9921387214560² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9921387214560.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18607356 + ... + 19133124.

It is an arithmetic number, because the mean of its divisors is an integer number (325554418035).

It is a 1-persistent number, because it is pandigital, but 2⋅9921387214560 = 19842774429120 is not.

Almost surely, 2^{9921387214560} is an apocalyptic number.

It is an amenable number.

9921387214560 is an abundant number, since it is smaller than the sum of its proper divisors (21331836916800).

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

9921387214560 is a wasteful number, since it uses less digits than its factorization.

9921387214560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565100 (or 565092 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 57.

The spelling of 9921387214560 in words is "nine trillion, nine hundred twenty-one billion, three hundred eighty-seven million, two hundred fourteen thousand, five hundred sixty".