22161223 has 4 divisors (see below), whose sum is σ = 25327120. Its totient is φ = 18995328.

The previous prime is 22161199. The next prime is 22161229. The reversal of 22161223 is 32216122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22161223 is a prime.

It is a super-2 number, since 2×22161223² = 982239609711458, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22161223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22161229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1582938 + ... + 1582951.

It is an arithmetic number, because the mean of its divisors is an integer number (6331780).

Almost surely, 2^22161223 is an apocalyptic number.

22161223 is a deficient number, since it is larger than the sum of its proper divisors (3165897).

22161223 is an equidigital number, since it uses as much as digits as its factorization.

22161223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165896.

The product of its digits is 288, while the sum is 19.

The square root of 22161223 is about 4707.5708173112. The cubic root of 22161223 is about 280.8867423498.

Adding to 22161223 its reverse (32216122), we get a palindrome (54377345).

The spelling of 22161223 in words is "twenty-two million, one hundred sixty-one thousand, two hundred twenty-three".