9998997321 has 16 divisors (see below), whose sum is σ = 14119056000. Its totient is φ = 6272625408.

The previous prime is 9998997313. The next prime is 9998997341. The reversal of 9998997321 is 1237998999.

It is not a de Polignac number, because 9998997321 - 2³ = 9998997313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9998997341) 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, 283155 + ... + 316503.

It is an arithmetic number, because the mean of its divisors is an integer number (882441000).

Almost surely, 2^9998997321 is an apocalyptic number.

It is an amenable number.

9998997321 is a deficient number, since it is larger than the sum of its proper divisors (4120058679).

9998997321 is a wasteful number, since it uses less digits than its factorization.

9998997321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39248.

The product of its digits is 19840464, while the sum is 66.

The square root of 9998997321 is about 99994.9864793231. The cubic root of 9998997321 is about 2154.3626807444.

The spelling of 9998997321 in words is "nine billion, nine hundred ninety-eight million, nine hundred ninety-seven thousand, three hundred twenty-one".