9912016321 has 4 divisors (see below), whose sum is σ = 10179908692. Its totient is φ = 9644123952.

The previous prime is 9912016271. The next prime is 9912016337. The reversal of 9912016321 is 1236102199.

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 8734771600 + 1177244721 = 93460^2 + 34311^2 .

It is a cyclic number.

It is not a de Polignac number, because 9912016321 - 2⁹ = 9912015809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9912016351) 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, 133946130 + ... + 133946203.

It is an arithmetic number, because the mean of its divisors is an integer number (2544977173).

Almost surely, 2^9912016321 is an apocalyptic number.

It is an amenable number.

9912016321 is a deficient number, since it is larger than the sum of its proper divisors (267892371).

9912016321 is a wasteful number, since it uses less digits than its factorization.

9912016321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267892370.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 9912016321 is about 99559.1096836447. The cubic root of 9912016321 is about 2148.0975650742.

The spelling of 9912016321 in words is "nine billion, nine hundred twelve million, sixteen thousand, three hundred twenty-one".