28222111 has 2 divisors, whose sum is σ = 28222112. Its totient is φ = 28222110.

The previous prime is 28222109. The next prime is 28222123. The reversal of 28222111 is 11122282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28222111 - 2¹ = 28222109 is a prime.

Together with 28222109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28222141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14111055 + 14111056.

It is an arithmetic number, because the mean of its divisors is an integer number (14111056).

Almost surely, 2^28222111 is an apocalyptic number.

28222111 is a deficient number, since it is larger than the sum of its proper divisors (1).

28222111 is an equidigital number, since it uses as much as digits as its factorization.

28222111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128, while the sum is 19.

The square root of 28222111 is about 5312.4486821051. The cubic root of 28222111 is about 304.4597117578.

Adding to 28222111 its reverse (11122282), we get a palindrome (39344393).

The spelling of 28222111 in words is "twenty-eight million, two hundred twenty-two thousand, one hundred eleven".