9888765444321 has 16 divisors (see below), whose sum is σ = 13535905033728. Its totient is φ = 6417765660800.

The previous prime is 9888765444307. The next prime is 9888765444347. The reversal of 9888765444321 is 1234445678889.

It is a cyclic number.

It is not a de Polignac number, because 9888765444321 - 2⁷ = 9888765444193 is a prime.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9888765444361) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 87141201 + ... + 87254606.

It is an arithmetic number, because the mean of its divisors is an integer number (845994064608).

Almost surely, 2^{9888765444321} is an apocalyptic number.

It is an amenable number.

9888765444321 is a deficient number, since it is larger than the sum of its proper divisors (3647139589407).

9888765444321 is a wasteful number, since it uses less digits than its factorization.

9888765444321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174396312.

The product of its digits is 371589120, while the sum is 69.

The spelling of 9888765444321 in words is "nine trillion, eight hundred eighty-eight billion, seven hundred sixty-five million, four hundred forty-four thousand, three hundred twenty-one".