9421916921 has 4 divisors (see below), whose sum is σ = 9641031312. Its totient is φ = 9202802532.

The previous prime is 9421916887. The next prime is 9421916927. The reversal of 9421916921 is 1296191249.

9421916921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9421916921 - 2³⁰ = 8348175097 is a prime.

It is a super-2 number, since 2×9421916921² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9421916927) 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, 109557131 + ... + 109557216.

It is an arithmetic number, because the mean of its divisors is an integer number (2410257828).

Almost surely, 2^9421916921 is an apocalyptic number.

It is an amenable number.

9421916921 is a deficient number, since it is larger than the sum of its proper divisors (219114391).

9421916921 is a wasteful number, since it uses less digits than its factorization.

9421916921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219114390.

The product of its digits is 69984, while the sum is 44.

The square root of 9421916921 is about 97066.5592312821. The cubic root of 9421916921 is about 2112.0932575261.

The spelling of 9421916921 in words is "nine billion, four hundred twenty-one million, nine hundred sixteen thousand, nine hundred twenty-one".