21622265 has 16 divisors (see below), whose sum is σ = 29749248. Its totient is φ = 14778816.

The previous prime is 21622259. The next prime is 21622267. The reversal of 21622265 is 56222612.

It is a cyclic number.

It is not a de Polignac number, because 21622265 - 2⁶ = 21622201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21622267) 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, 12599 + ... + 14211.

It is an arithmetic number, because the mean of its divisors is an integer number (1859328).

Almost surely, 2^21622265 is an apocalyptic number.

It is an amenable number.

21622265 is a deficient number, since it is larger than the sum of its proper divisors (8126983).

21622265 is a wasteful number, since it uses less digits than its factorization.

21622265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2008.

The product of its digits is 2880, while the sum is 26.

The square root of 21622265 is about 4649.9747311141. The cubic root of 21622265 is about 278.5909869490.

Adding to 21622265 its reverse (56222612), we get a palindrome (77844877).

The spelling of 21622265 in words is "twenty-one million, six hundred twenty-two thousand, two hundred sixty-five".