22121789 has 4 divisors (see below), whose sum is σ = 22208124. Its totient is φ = 22035456.

The previous prime is 22121779. The next prime is 22121807. The reversal of 22121789 is 98712122.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16337764 + 5784025 = 4042^2 + 2405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22121789 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 (22121779) 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 3 ways as a sum of consecutive naturals, for example, 42782 + ... + 43295.

It is an arithmetic number, because the mean of its divisors is an integer number (5552031).

Almost surely, 2^22121789 is an apocalyptic number.

It is an amenable number.

22121789 is a deficient number, since it is larger than the sum of its proper divisors (86335).

22121789 is an equidigital number, since it uses as much as digits as its factorization.

22121789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86334.

The product of its digits is 4032, while the sum is 32.

The square root of 22121789 is about 4703.3805927226. The cubic root of 22121789 is about 280.7200387915.

The spelling of 22121789 in words is "twenty-two million, one hundred twenty-one thousand, seven hundred eighty-nine".