22172161 has 24 divisors (see below), whose sum is σ = 26353152. Its totient is φ = 18585600.

The previous prime is 22172159. The next prime is 22172173. The reversal of 22172161 is 16127122.

It is a happy number.

It is not a de Polignac number, because 22172161 - 2¹ = 22172159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22172191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86145 + ... + 86401.

It is an arithmetic number, because the mean of its divisors is an integer number (1098048).

Almost surely, 2^22172161 is an apocalyptic number.

It is an amenable number.

22172161 is a deficient number, since it is larger than the sum of its proper divisors (4180991).

22172161 is a wasteful number, since it uses less digits than its factorization.

22172161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 322 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 22172161 is about 4708.7324196646. The cubic root of 22172161 is about 280.9329466870.

Adding to 22172161 its reverse (16127122), we get a palindrome (38299283).

The spelling of 22172161 in words is "twenty-two million, one hundred seventy-two thousand, one hundred sixty-one".