2221001065 has 4 divisors (see below), whose sum is σ = 2665201284. Its totient is φ = 1776800848.

The previous prime is 2221001053. The next prime is 2221001071. The reversal of 2221001065 is 5601001222.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1259753049 + 961248016 = 35493^2 + 31004^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221001065 - 2⁹ = 2221000553 is a prime.

It is a super-2 number, since 2×2221001065² = 9865691461462268450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 222100102 + ... + 222100111.

It is an arithmetic number, because the mean of its divisors is an integer number (666300321).

Almost surely, 2^2221001065 is an apocalyptic number.

It is an amenable number.

2221001065 is a deficient number, since it is larger than the sum of its proper divisors (444200219).

2221001065 is an equidigital number, since it uses as much as digits as its factorization.

2221001065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444200218.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2221001065 is about 47127.4979709299. The cubic root of 2221001065 is about 1304.7168031469.

Adding to 2221001065 its reverse (5601001222), we get a palindrome (7822002287).

The spelling of 2221001065 in words is "two billion, two hundred twenty-one million, one thousand, sixty-five".