22005421 has 4 divisors (see below), whose sum is σ = 22093344. Its totient is φ = 21917500.

The previous prime is 22005419. The next prime is 22005449. The reversal of 22005421 is 12450022.

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 22005421 - 2¹ = 22005419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22005395 and 22005404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22005521) 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, 43585 + ... + 44086.

It is an arithmetic number, because the mean of its divisors is an integer number (5523336).

Almost surely, 2^22005421 is an apocalyptic number.

It is an amenable number.

22005421 is a deficient number, since it is larger than the sum of its proper divisors (87923).

22005421 is an equidigital number, since it uses as much as digits as its factorization.

22005421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87922.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 22005421 is about 4690.9936047707. The cubic root of 22005421 is about 280.2269461076.

Adding to 22005421 its reverse (12450022), we get a palindrome (34455443).

The spelling of 22005421 in words is "twenty-two million, five thousand, four hundred twenty-one".