22444021 has 4 divisors (see below), whose sum is σ = 23419872. Its totient is φ = 21468172.

The previous prime is 22444007. The next prime is 22444027. The reversal of 22444021 is 12044422.

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 22444021 - 2⁵ = 22443989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22444021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22444027) 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, 487891 + ... + 487936.

It is an arithmetic number, because the mean of its divisors is an integer number (5854968).

Almost surely, 2^22444021 is an apocalyptic number.

It is an amenable number.

22444021 is a deficient number, since it is larger than the sum of its proper divisors (975851).

22444021 is an equidigital number, since it uses as much as digits as its factorization.

22444021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975850.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 22444021 is about 4737.5121108025. The cubic root of 22444021 is about 282.0764886492.

Adding to 22444021 its reverse (12044422), we get a palindrome (34488443).

The spelling of 22444021 in words is "twenty-two million, four hundred forty-four thousand, twenty-one".