22243421 has 4 divisors (see below), whose sum is σ = 22257312. Its totient is φ = 22229532.

The previous prime is 22243393. The next prime is 22243423. The reversal of 22243421 is 12434222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22243421 - 2¹⁰ = 22242397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22243393 and 22243402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22243423) 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, 4175 + ... + 7868.

It is an arithmetic number, because the mean of its divisors is an integer number (5564328).

Almost surely, 2^22243421 is an apocalyptic number.

It is an amenable number.

22243421 is a deficient number, since it is larger than the sum of its proper divisors (13891).

22243421 is a wasteful number, since it uses less digits than its factorization.

22243421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13890.

The product of its digits is 768, while the sum is 20.

The square root of 22243421 is about 4716.2931418647. The cubic root of 22243421 is about 281.2335920634.

Adding to 22243421 its reverse (12434222), we get a palindrome (34677643).

The spelling of 22243421 in words is "twenty-two million, two hundred forty-three thousand, four hundred twenty-one".