22221265 has 16 divisors (see below), whose sum is σ = 30030336. Its totient is φ = 15638400.

The previous prime is 22221259. The next prime is 22221299. The reversal of 22221265 is 56212222.

It is a happy number.

It is not a de Polignac number, because 22221265 - 2⁵ = 22221233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4812 + ... + 8221.

It is an arithmetic number, because the mean of its divisors is an integer number (1876896).

Almost surely, 2^22221265 is an apocalyptic number.

It is an amenable number.

22221265 is a deficient number, since it is larger than the sum of its proper divisors (7809071).

22221265 is a wasteful number, since it uses less digits than its factorization.

22221265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13080.

The product of its digits is 960, while the sum is 22.

The square root of 22221265 is about 4713.9436780683. The cubic root of 22221265 is about 281.1401849468.

Adding to 22221265 its reverse (56212222), we get a palindrome (78433487).

The spelling of 22221265 in words is "twenty-two million, two hundred twenty-one thousand, two hundred sixty-five".