22128191 has 4 divisors (see below), whose sum is σ = 22347384. Its totient is φ = 21909000.

The previous prime is 22128173. The next prime is 22128193. The reversal of 22128191 is 19182122.

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

It is a cyclic number.

It is not a de Polignac number, because 22128191 - 2¹⁴ = 22111807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22128191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22128193) 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, 109445 + ... + 109646.

It is an arithmetic number, because the mean of its divisors is an integer number (5586846).

Almost surely, 2^22128191 is an apocalyptic number.

22128191 is a deficient number, since it is larger than the sum of its proper divisors (219193).

22128191 is a wasteful number, since it uses less digits than its factorization.

22128191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219192.

The product of its digits is 576, while the sum is 26.

The square root of 22128191 is about 4704.0611178002. The cubic root of 22128191 is about 280.7471161126.

The spelling of 22128191 in words is "twenty-two million, one hundred twenty-eight thousand, one hundred ninety-one".