22144221 has 12 divisors (see below), whose sum is σ = 34894080. Its totient is φ = 13420680.

The previous prime is 22144219. The next prime is 22144247. The reversal of 22144221 is 12244122.

22144221 is a `hidden beast` number, since 221 + 442 + 2 + 1 = 666.

It is not a de Polignac number, because 22144221 - 2¹ = 22144219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22144194 and 22144203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22144021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111741 + ... + 111938.

It is an arithmetic number, because the mean of its divisors is an integer number (2907840).

Almost surely, 2^22144221 is an apocalyptic number.

It is an amenable number.

22144221 is a deficient number, since it is larger than the sum of its proper divisors (12749859).

22144221 is a wasteful number, since it uses less digits than its factorization.

22144221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223696 (or 223693 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 22144221 is about 4705.7646562488. The cubic root of 22144221 is about 280.8148922508.

Adding to 22144221 its reverse (12244122), we get a palindrome (34388343).

Subtracting from 22144221 its reverse (12244122), we obtain a palindrome (9900099).

The spelling of 22144221 in words is "twenty-two million, one hundred forty-four thousand, two hundred twenty-one".