9939329290721 has 4 divisors (see below), whose sum is σ = 9939335845572. Its totient is φ = 9939322735872.

The previous prime is 9939329290651. The next prime is 9939329290729. The reversal of 9939329290721 is 1270929239399.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4948684990096 + 4990644300625 = 2224564^2 + 2233975^2 .

It is a cyclic number.

It is not a de Polignac number, because 9939329290721 - 2¹⁰ = 9939329289697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9939329290729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295241 + ... + 4468313.

It is an arithmetic number, because the mean of its divisors is an integer number (2484833961393).

Almost surely, 2^{9939329290721} is an apocalyptic number.

It is an amenable number.

9939329290721 is a deficient number, since it is larger than the sum of its proper divisors (6554851).

9939329290721 is a wasteful number, since it uses less digits than its factorization.

9939329290721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6554850.

The product of its (nonzero) digits is 29760696, while the sum is 65.

The spelling of 9939329290721 in words is "nine trillion, nine hundred thirty-nine billion, three hundred twenty-nine million, two hundred ninety thousand, seven hundred twenty-one".