22156 has 12 divisors (see below), whose sum is σ = 40320.
Its totient is φ = 10640.
The previous prime is 22153. The next prime is 22157. The reversal of 22156 is 65122.
Adding to 22156 its reverse (65122), we get a palindrome (87278).
It is a happy number.
It is a pancake number, because a pancake can be divided into 22156 parts by 210 straight cuts.
It is a plaindrome in base 9 and base 16.
It is not an unprimeable number, because it can be changed into a prime (22153) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21 + ... + 211.
It is an arithmetic number, because the mean of its divisors is an integer number (3360).
222156 is an apocalyptic number.
It is an amenable number.
22156 is a deficient number, since it is larger than the sum of its proper divisors (18164).
22156 is a wasteful number, since it uses less digits than its factorization.
22156 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 224 (or 222 counting only the distinct ones).
The product of its digits is 120, while the sum is 16.
The square root of 22156 is about 148.8489166907.
The cubic root of 22156 is about 28.0864673972.
The spelling of 22156 in words is "twenty-two thousand, one hundred fifty-six".