21322265 has 16 divisors (see below), whose sum is σ = 27565056. Its totient is φ = 15787200.

The previous prime is 21322241. The next prime is 21322277. The reversal of 21322265 is 56222312.

It is not a de Polignac number, because 21322265 - 2⁶ = 21322201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

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 21322265.

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, 575 + ... + 6555.

It is an arithmetic number, because the mean of its divisors is an integer number (1722816).

Almost surely, 2^21322265 is an apocalyptic number.

It is an amenable number.

21322265 is a deficient number, since it is larger than the sum of its proper divisors (6242791).

21322265 is a wasteful number, since it uses less digits than its factorization.

21322265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6040.

The product of its digits is 1440, while the sum is 23.

The square root of 21322265 is about 4617.6038158335. The cubic root of 21322265 is about 277.2965367321.

Adding to 21322265 its reverse (56222312), we get a palindrome (77544577).

The spelling of 21322265 in words is "twenty-one million, three hundred twenty-two thousand, two hundred sixty-five".