2221665 has 16 divisors (see below), whose sum is σ = 3651648. Its totient is φ = 1152576.

The previous prime is 2221657. The next prime is 2221669. The reversal of 2221665 is 5661222.

It is not a de Polignac number, because 2221665 - 2³ = 2221657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2221669) 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, 1447 + ... + 2556.

It is an arithmetic number, because the mean of its divisors is an integer number (228228).

2^2221665 is an apocalyptic number.

It is an amenable number.

2221665 is a deficient number, since it is larger than the sum of its proper divisors (1429983).

2221665 is a wasteful number, since it uses less digits than its factorization.

2221665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4048.

The product of its digits is 1440, while the sum is 24.

The square root of 2221665 is about 1490.5250752671. The cubic root of 2221665 is about 130.4846798709.

Adding to 2221665 its reverse (5661222), we get a palindrome (7882887).

The spelling of 2221665 in words is "two million, two hundred twenty-one thousand, six hundred sixty-five".