9921082165 has 16 divisors (see below), whose sum is σ = 12111652800. Its totient is φ = 7799398272.

The previous prime is 9921082103. The next prime is 9921082169. The reversal of 9921082165 is 5612801299.

It is a cyclic number.

It is not a de Polignac number, because 9921082165 - 2¹⁷ = 9920951093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921082169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1107394 + ... + 1116316.

It is an arithmetic number, because the mean of its divisors is an integer number (756978300).

Almost surely, 2^9921082165 is an apocalyptic number.

It is an amenable number.

9921082165 is a deficient number, since it is larger than the sum of its proper divisors (2190570635).

9921082165 is a wasteful number, since it uses less digits than its factorization.

9921082165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12756.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 9921082165 is about 99604.6292347901. The cubic root of 9921082165 is about 2148.7522715279.

The spelling of 9921082165 in words is "nine billion, nine hundred twenty-one million, eighty-two thousand, one hundred sixty-five".