22128161 has 8 divisors (see below), whose sum is σ = 24220704. Its totient is φ = 20049120.

The previous prime is 22128149. The next prime is 22128167. The reversal of 22128161 is 16182122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22128161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22128167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230 + ... + 6656.

It is an arithmetic number, because the mean of its divisors is an integer number (3027588).

Almost surely, 2^22128161 is an apocalyptic number.

It is an amenable number.

22128161 is a deficient number, since it is larger than the sum of its proper divisors (2092543).

22128161 is a wasteful number, since it uses less digits than its factorization.

22128161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6751.

The product of its digits is 384, while the sum is 23.

The square root of 22128161 is about 4704.0579290651. The cubic root of 22128161 is about 280.7469892395.

It can be divided in two parts, 221 and 28161, that added together give a palindrome (28382).

The spelling of 22128161 in words is "twenty-two million, one hundred twenty-eight thousand, one hundred sixty-one".