22224021 has 4 divisors (see below), whose sum is σ = 29632032. Its totient is φ = 14816012.

The previous prime is 22223989. The next prime is 22224023. The reversal of 22224021 is 12042222.

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 22224021 - 2⁵ = 22223989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22224023) 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, 3704001 + ... + 3704006.

It is an arithmetic number, because the mean of its divisors is an integer number (7408008).

Almost surely, 2^22224021 is an apocalyptic number.

It is an amenable number.

22224021 is a deficient number, since it is larger than the sum of its proper divisors (7408011).

22224021 is an equidigital number, since it uses as much as digits as its factorization.

22224021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7408010.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 22224021 is about 4714.2359932443. The cubic root of 22224021 is about 281.1518073023.

Adding to 22224021 its reverse (12042222), we get a palindrome (34266243).

The spelling of 22224021 in words is "twenty-two million, two hundred twenty-four thousand, twenty-one".