99921197377920 has 256 divisors, whose sum is σ = 321776076415680. Its totient is φ = 26371679846400.

The previous prime is 99921197377919. The next prime is 99921197377961. The reversal of 99921197377920 is 2977379112999.

It is a Smith number, since the sum of its digits (75) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 510493512 + ... + 510689208.

Almost surely, 2^{99921197377920} 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 99921197377920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160888038207840).

99921197377920 is an abundant number, since it is smaller than the sum of its proper divisors (221854879037760).

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

99921197377920 is a wasteful number, since it uses less digits than its factorization.

99921197377920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198453 (or 198441 counting only the distinct ones).

The product of its (nonzero) digits is 243045684, while the sum is 75.

The spelling of 99921197377920 in words is "ninety-nine trillion, nine hundred twenty-one billion, one hundred ninety-seven million, three hundred seventy-seven thousand, nine hundred twenty".