9399207821 has 8 divisors (see below), whose sum is σ = 9435628224. Its totient is φ = 9362852800.

The previous prime is 9399207787. The next prime is 9399207823. The reversal of 9399207821 is 1287029939.

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 9399207821 - 2³⁰ = 8325465997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9399207821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9399207823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282170 + ... + 313716.

It is an arithmetic number, because the mean of its divisors is an integer number (1179453528).

Almost surely, 2^9399207821 is an apocalyptic number.

It is an amenable number.

9399207821 is a deficient number, since it is larger than the sum of its proper divisors (36420403).

9399207821 is a wasteful number, since it uses less digits than its factorization.

9399207821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32691.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 9399207821 is about 96949.5117109932. The cubic root of 9399207821 is about 2110.3950070951.

The spelling of 9399207821 in words is "nine billion, three hundred ninety-nine million, two hundred seven thousand, eight hundred twenty-one".