22423421 has 4 divisors (see below), whose sum is σ = 22561152. Its totient is φ = 22285692.

The previous prime is 22423403. The next prime is 22423441. The reversal of 22423421 is 12432422.

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 a de Polignac number, because none of the positive numbers 2^k-22423421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22423393 and 22423402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22423441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68621 + ... + 68946.

It is an arithmetic number, because the mean of its divisors is an integer number (5640288).

Almost surely, 2^22423421 is an apocalyptic number.

It is an amenable number.

22423421 is a deficient number, since it is larger than the sum of its proper divisors (137731).

22423421 is a wasteful number, since it uses less digits than its factorization.

22423421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137730.

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

The square root of 22423421 is about 4735.3374747741. The cubic root of 22423421 is about 281.9901619558.

Adding to 22423421 its reverse (12432422), we get a palindrome (34855843).

Subtracting from 22423421 its reverse (12432422), we obtain a palindrome (9990999).

The spelling of 22423421 in words is "twenty-two million, four hundred twenty-three thousand, four hundred twenty-one".