22122211 has 4 divisors (see below), whose sum is σ = 22145832. Its totient is φ = 22098592.

The previous prime is 22122203. The next prime is 22122223. The reversal of 22122211 is 11222122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22122211 - 2³ = 22122203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22122191 and 22122200.

It is not an unprimeable number, because it can be changed into a prime (22122241) 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, 10345 + ... + 12298.

It is an arithmetic number, because the mean of its divisors is an integer number (5536458).

Almost surely, 2^22122211 is an apocalyptic number.

22122211 is a deficient number, since it is larger than the sum of its proper divisors (23621).

22122211 is an equidigital number, since it uses as much as digits as its factorization.

22122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23620.

The product of its digits is 32, while the sum is 13.

The square root of 22122211 is about 4703.4254538581. The cubic root of 22122211 is about 280.7218238054.

Adding to 22122211 its reverse (11222122), we get a palindrome (33344333).

The spelling of 22122211 in words is "twenty-two million, one hundred twenty-two thousand, two hundred eleven".