9930031721 has 4 divisors (see below), whose sum is σ = 10514151252. Its totient is φ = 9345912192.

The previous prime is 9930031711. The next prime is 9930031747. The reversal of 9930031721 is 1271300399.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3183216400 + 6746815321 = 56420^2 + 82139^2 .

It is a cyclic number.

It is not a de Polignac number, because 9930031721 - 2¹⁰ = 9930030697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9930031711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292059740 + ... + 292059773.

It is an arithmetic number, because the mean of its divisors is an integer number (2628537813).

Almost surely, 2^9930031721 is an apocalyptic number.

It is an amenable number.

9930031721 is a deficient number, since it is larger than the sum of its proper divisors (584119531).

9930031721 is a wasteful number, since it uses less digits than its factorization.

9930031721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584119530.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 9930031721 is about 99649.5445097468. The cubic root of 9930031721 is about 2149.3981889439.

The spelling of 9930031721 in words is "nine billion, nine hundred thirty million, thirty-one thousand, seven hundred twenty-one".