22111 has 2 divisors, whose sum is σ = 22112.
Its totient is φ = 22110.
The previous prime is 22109. The next prime is 22123. The reversal of 22111 is 11122.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 22111 - 21 = 22109 is a prime.
Together with 22109, it forms a pair of twin primes.
22111 is a modest number, since divided by 111 gives 22 as remainder.
It is a nialpdrome in base 10.
It is a zygodrome in base 10.
It is a junction number, because it is equal to n+sod(n) for n = 22094 and 22103.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (22171) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11055 + 11056.
It is an arithmetic number, because the mean of its divisors is an integer number (11056).
222111 is an apocalyptic number.
22111 is the 67-th centered decagonal number.
22111 is a deficient number, since it is larger than the sum of its proper divisors (1).
22111 is an equidigital number, since it uses as much as digits as its factorization.
22111 is an evil number, because the sum of its binary digits is even.
The product of its digits is 4, while the sum is 7.
The square root of 22111 is about 148.6976798743.
The cubic root of 22111 is about 28.0674394789.
Adding to 22111 its reverse (11122), we get a palindrome (33233).
It can be divided in two parts, 221 and 11, that added together give a palindrome (232).
The spelling of 22111 in words is "twenty-two thousand, one hundred eleven", and thus it is an iban number.