22244021 has 4 divisors (see below), whose sum is σ = 22356000. Its totient is φ = 22132044.

The previous prime is 22244011. The next prime is 22244069. The reversal of 22244021 is 12044222.

It is a happy number.

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-22244021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22244011) 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, 55691 + ... + 56088.

It is an arithmetic number, because the mean of its divisors is an integer number (5589000).

Almost surely, 2^22244021 is an apocalyptic number.

It is an amenable number.

22244021 is a deficient number, since it is larger than the sum of its proper divisors (111979).

22244021 is a wasteful number, since it uses less digits than its factorization.

22244021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111978.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 22244021 is about 4716.3567507134. The cubic root of 22244021 is about 281.2361207307.

Adding to 22244021 its reverse (12044222), we get a palindrome (34288243).

The spelling of 22244021 in words is "twenty-two million, two hundred forty-four thousand, twenty-one".