22213424221 has 4 divisors (see below), whose sum is σ = 23520096252. Its totient is φ = 20906752192.

The previous prime is 22213424213. The next prime is 22213424243. The reversal of 22213424221 is 12242431222.

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 12685516900 + 9527907321 = 112630^2 + 97611^2 .

It is a cyclic number.

It is not a de Polignac number, because 22213424221 - 2³ = 22213424213 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 (22213424291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653335990 + ... + 653336023.

It is an arithmetic number, because the mean of its divisors is an integer number (5880024063).

Almost surely, 2^22213424221 is an apocalyptic number.

It is an amenable number.

22213424221 is a deficient number, since it is larger than the sum of its proper divisors (1306672031).

22213424221 is a wasteful number, since it uses less digits than its factorization.

22213424221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306672030.

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

Adding to 22213424221 its reverse (12242431222), we get a palindrome (34455855443).

The spelling of 22213424221 in words is "twenty-two billion, two hundred thirteen million, four hundred twenty-four thousand, two hundred twenty-one".