22128923 has 4 divisors (see below), whose sum is σ = 22727040. Its totient is φ = 21530808.

The previous prime is 22128919. The next prime is 22128929. The reversal of 22128923 is 32982122.

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 22128923 - 2² = 22128919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22128929) 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, 299003 + ... + 299076.

It is an arithmetic number, because the mean of its divisors is an integer number (5681760).

Almost surely, 2^22128923 is an apocalyptic number.

22128923 is a deficient number, since it is larger than the sum of its proper divisors (598117).

22128923 is an equidigital number, since it uses as much as digits as its factorization.

22128923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598116.

The product of its digits is 3456, while the sum is 29.

The square root of 22128923 is about 4704.1389222683. The cubic root of 22128923 is about 280.7502117810.

The spelling of 22128923 in words is "twenty-two million, one hundred twenty-eight thousand, nine hundred twenty-three".