22161 has 8 divisors (see below), whose sum is σ = 30240. Its totient is φ = 14432.

The previous prime is 22159. The next prime is 22171. The reversal of 22161 is 16122.

22161 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22161 - 2¹ = 22159 is a prime.

It is a super-2 number, since 2×22161² = 982219842, which contains 22 as substring.

It is a nialpdrome in base 8.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 22161.

It is not an unprimeable number, because it can be changed into a prime (22111) 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 7 ways as a sum of consecutive naturals, for example, 205 + ... + 293.

It is an arithmetic number, because the mean of its divisors is an integer number (3780).

2²²¹⁶¹ is an apocalyptic number.

It is an amenable number.

22161 is a deficient number, since it is larger than the sum of its proper divisors (8079).

22161 is an equidigital number, since it uses as much as digits as its factorization.

22161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175.

The product of its digits is 24, while the sum is 12.

The square root of 22161 is about 148.8657112971. The cubic root of 22161 is about 28.0885800194.

Adding to 22161 its reverse (16122), we get a palindrome (38283).

It can be divided in two parts, 221 and 61, that added together give a palindrome (282).

The spelling of 22161 in words is "twenty-two thousand, one hundred sixty-one".