2165320111 has 4 divisors (see below), whose sum is σ = 2200817224. Its totient is φ = 2129823000.

The previous prime is 2165320109. The next prime is 2165320117. The reversal of 2165320111 is 1110235612.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2165320111 - 2¹ = 2165320109 is a prime.

It is a super-2 number, since 2×2165320111² = 9377222366202104642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165320117) 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, 17748465 + ... + 17748586.

It is an arithmetic number, because the mean of its divisors is an integer number (550204306).

Almost surely, 2^2165320111 is an apocalyptic number.

2165320111 is a deficient number, since it is larger than the sum of its proper divisors (35497113).

2165320111 is an equidigital number, since it uses as much as digits as its factorization.

2165320111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35497112.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 2165320111 is about 46533.0002363914. Note that the first 3 decimals coincide. The cubic root of 2165320111 is about 1293.7212246052.

Subtracting from 2165320111 its sum of digits (22), we obtain a square (2165320089 = 46533²).

Adding to 2165320111 its reverse (1110235612), we get a palindrome (3275555723).

The spelling of 2165320111 in words is "two billion, one hundred sixty-five million, three hundred twenty thousand, one hundred eleven".