22144451 has 4 divisors (see below), whose sum is σ = 25307952. Its totient is φ = 18980952.

The previous prime is 22144439. The next prime is 22144453. The reversal of 22144451 is 15444122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15444122 = 2 ⋅7722061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22144451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22144453) 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, 1581740 + ... + 1581753.

It is an arithmetic number, because the mean of its divisors is an integer number (6326988).

Almost surely, 2^22144451 is an apocalyptic number.

22144451 is a deficient number, since it is larger than the sum of its proper divisors (3163501).

22144451 is an equidigital number, since it uses as much as digits as its factorization.

22144451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3163500.

The product of its digits is 1280, while the sum is 23.

The square root of 22144451 is about 4705.7890942965. The cubic root of 22144451 is about 280.8158644714.

Adding to 22144451 its reverse (15444122), we get a palindrome (37588573).

The spelling of 22144451 in words is "twenty-two million, one hundred forty-four thousand, four hundred fifty-one".