9999421851 has 8 divisors (see below), whose sum is σ = 13338515520. Its totient is φ = 6663304712.

The previous prime is 9999421841. The next prime is 9999421903. The reversal of 9999421851 is 1581249999.

9999421851 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9999421851 - 2⁹ = 9999421339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9999421791 and 9999421800.

It is not an unprimeable number, because it can be changed into a prime (9999421841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736281 + ... + 749738.

It is an arithmetic number, because the mean of its divisors is an integer number (1667314440).

Almost surely, 2^9999421851 is an apocalyptic number.

9999421851 is a deficient number, since it is larger than the sum of its proper divisors (3339093669).

9999421851 is a wasteful number, since it uses less digits than its factorization.

9999421851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488265.

The product of its digits is 2099520, while the sum is 57.

The square root of 9999421851 is about 99997.1092132168. The cubic root of 9999421851 is about 2154.3931697563.

The spelling of 9999421851 in words is "nine billion, nine hundred ninety-nine million, four hundred twenty-one thousand, eight hundred fifty-one".