22144121 has 4 divisors (see below), whose sum is σ = 22168692. Its totient is φ = 22119552.

The previous prime is 22144117. The next prime is 22144169. The reversal of 22144121 is 12144122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10310521 + 11833600 = 3211^2 + 3440^2 .

It is a cyclic number.

It is not a de Polignac number, because 22144121 - 2² = 22144117 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 22144121.

It is not an unprimeable number, because it can be changed into a prime (22144181) 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, 10880 + ... + 12753.

It is an arithmetic number, because the mean of its divisors is an integer number (5542173).

Almost surely, 2^22144121 is an apocalyptic number.

It is an amenable number.

22144121 is a deficient number, since it is larger than the sum of its proper divisors (24571).

22144121 is an equidigital number, since it uses as much as digits as its factorization.

22144121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24570.

The product of its digits is 128, while the sum is 17.

The square root of 22144121 is about 4705.7540309710. The cubic root of 22144121 is about 280.8144695441.

Adding to 22144121 its reverse (12144122), we get a palindrome (34288243).

Subtracting from 22144121 its reverse (12144122), we obtain a palindrome (9999999).

The spelling of 22144121 in words is "twenty-two million, one hundred forty-four thousand, one hundred twenty-one".