22266221 has 4 divisors (see below), whose sum is σ = 22293600. Its totient is φ = 22238844.

The previous prime is 22266191. The next prime is 22266247. The reversal of 22266221 is 12266222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22266221 - 2¹⁰ = 22265197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22266421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12431 + ... + 14108.

It is an arithmetic number, because the mean of its divisors is an integer number (5573400).

Almost surely, 2^22266221 is an apocalyptic number.

It is an amenable number.

22266221 is a deficient number, since it is larger than the sum of its proper divisors (27379).

22266221 is an equidigital number, since it uses as much as digits as its factorization.

22266221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27378.

The product of its digits is 1152, while the sum is 23.

The square root of 22266221 is about 4718.7096753244. The cubic root of 22266221 is about 281.3296494742.

Subtracting from 22266221 its reverse (12266222), we obtain a palindrome (9999999).

The spelling of 22266221 in words is "twenty-two million, two hundred sixty-six thousand, two hundred twenty-one".