22044021 has 4 divisors (see below), whose sum is σ = 29392032. Its totient is φ = 14696012.

The previous prime is 22044017. The next prime is 22044049. The reversal of 22044021 is 12044022.

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 22044021 - 2² = 22044017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22044091) 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, 3674001 + ... + 3674006.

It is an arithmetic number, because the mean of its divisors is an integer number (7348008).

Almost surely, 2^22044021 is an apocalyptic number.

It is an amenable number.

22044021 is a deficient number, since it is larger than the sum of its proper divisors (7348011).

22044021 is an equidigital number, since it uses as much as digits as its factorization.

22044021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7348010.

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

The square root of 22044021 is about 4695.1060690894. The cubic root of 22044021 is about 280.3907003278.

Adding to 22044021 its reverse (12044022), we get a palindrome (34088043).

Subtracting from 22044021 its reverse (12044022), we obtain a palindrome (9999999).

The spelling of 22044021 in words is "twenty-two million, forty-four thousand, twenty-one".