22124423221 has 4 divisors (see below), whose sum is σ = 22125026700. Its totient is φ = 22123819744.

The previous prime is 22124423219. The next prime is 22124423227. The reversal of 22124423221 is 12232442122.

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 15206342596 + 6918080625 = 123314^2 + 83175^2 .

It is a cyclic number.

It is not a de Polignac number, because 22124423221 - 2¹ = 22124423219 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 (22124423227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242926 + ... + 321343.

It is an arithmetic number, because the mean of its divisors is an integer number (5531256675).

Almost surely, 2^22124423221 is an apocalyptic number.

It is an amenable number.

22124423221 is a deficient number, since it is larger than the sum of its proper divisors (603479).

22124423221 is an equidigital number, since it uses as much as digits as its factorization.

22124423221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603478.

The product of its digits is 3072, while the sum is 25.

Adding to 22124423221 its reverse (12232442122), we get a palindrome (34356865343).

The spelling of 22124423221 in words is "twenty-two billion, one hundred twenty-four million, four hundred twenty-three thousand, two hundred twenty-one".