22222211 has 16 divisors (see below), whose sum is σ = 25256448. Its totient is φ = 19375200.

The previous prime is 22222199. The next prime is 22222223. The reversal of 22222211 is 11222222.

It is an interprime number because it is at equal distance from previous prime (22222199) and next prime (22222223).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22222211 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (22222261) by changing a digit.

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, 26996 + ... + 27806.

It is an arithmetic number, because the mean of its divisors is an integer number (1578528).

Almost surely, 2^22222211 is an apocalyptic number.

22222211 is a deficient number, since it is larger than the sum of its proper divisors (3034237).

22222211 is a wasteful number, since it uses less digits than its factorization.

22222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922.

The product of its digits is 64, while the sum is 14.

The square root of 22222211 is about 4714.0440176138. The cubic root of 22222211 is about 281.1441744413.

Adding to 22222211 its reverse (11222222), we get a palindrome (33444433).

It can be divided in two parts, 2222221 and 1, that added together give a palindrome (2222222).

The spelling of 22222211 in words is "twenty-two million, two hundred twenty-two thousand, two hundred eleven".