2221565 has 8 divisors (see below), whose sum is σ = 2673888. Its totient is φ = 1771920.

The previous prime is 2221523. The next prime is 2221567. The reversal of 2221565 is 5651222.

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

It is not a de Polignac number, because 2221565 - 2¹⁸ = 1959421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2221565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2870 + ... + 3560.

It is an arithmetic number, because the mean of its divisors is an integer number (334236).

2^2221565 is an apocalyptic number.

It is an amenable number.

2221565 is a deficient number, since it is larger than the sum of its proper divisors (452323).

2221565 is an equidigital number, since it uses as much as digits as its factorization.

2221565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339.

The product of its digits is 1200, while the sum is 23.

The square root of 2221565 is about 1490.4915296640. The cubic root of 2221565 is about 130.4827220805.

Adding to 2221565 its reverse (5651222), we get a palindrome (7872787).

The spelling of 2221565 in words is "two million, two hundred twenty-one thousand, five hundred sixty-five".