22123891 has 8 divisors (see below), whose sum is σ = 23035904. Its totient is φ = 21228480.

The previous prime is 22123889. The next prime is 22123901. The reversal of 22123891 is 19832122.

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

It is a cyclic number.

It is not a de Polignac number, because 22123891 - 2¹ = 22123889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22123841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1395 + ... + 6796.

It is an arithmetic number, because the mean of its divisors is an integer number (2879488).

Almost surely, 2^22123891 is an apocalyptic number.

22123891 is a deficient number, since it is larger than the sum of its proper divisors (912013).

22123891 is an equidigital number, since it uses as much as digits as its factorization.

22123891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8301.

The product of its digits is 1728, while the sum is 28.

The square root of 22123891 is about 4703.6040437095. The cubic root of 22123891 is about 280.7289297969.

The spelling of 22123891 in words is "twenty-two million, one hundred twenty-three thousand, eight hundred ninety-one".