2165336521 has 8 divisors (see below), whose sum is σ = 2205014400. Its totient is φ = 2125758000.

The previous prime is 2165336513. The next prime is 2165336573. The reversal of 2165336521 is 1256335612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2165336521 - 2³ = 2165336513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165336221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19875 + ... + 68743.

It is an arithmetic number, because the mean of its divisors is an integer number (275626800).

Almost surely, 2^2165336521 is an apocalyptic number.

It is an amenable number.

2165336521 is a deficient number, since it is larger than the sum of its proper divisors (39677879).

2165336521 is an equidigital number, since it uses as much as digits as its factorization.

2165336521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49679.

The product of its digits is 32400, while the sum is 34.

The square root of 2165336521 is about 46533.1765625344. The cubic root of 2165336521 is about 1293.7244927766.

Subtracting from 2165336521 its reverse (1256335612), we obtain a palindrome (909000909).

The spelling of 2165336521 in words is "two billion, one hundred sixty-five million, three hundred thirty-six thousand, five hundred twenty-one".