2165222001 has 16 divisors (see below), whose sum is σ = 3109662720. Its totient is φ = 1336180560.

The previous prime is 2165221999. The next prime is 2165222039. The reversal of 2165222001 is 1002225612.

It is a happy number.

It is not a de Polignac number, because 2165222001 - 2¹ = 2165221999 is a prime.

It is a super-2 number, since 2×2165222001² = 9376372627228888002, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2165222071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 503991 + ... + 508268.

It is an arithmetic number, because the mean of its divisors is an integer number (194353920).

Almost surely, 2^2165222001 is an apocalyptic number.

It is an amenable number.

2165222001 is a deficient number, since it is larger than the sum of its proper divisors (944440719).

2165222001 is a wasteful number, since it uses less digits than its factorization.

2165222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012316.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 2165222001 is about 46531.9460263591. The cubic root of 2165222001 is about 1293.7016849375.

Adding to 2165222001 its reverse (1002225612), we get a palindrome (3167447613).

The spelling of 2165222001 in words is "two billion, one hundred sixty-five million, two hundred twenty-two thousand, one".