21444226 has 8 divisors (see below), whose sum is σ = 32198220. Its totient is φ = 10711488.

The previous prime is 21444223. The next prime is 21444233. The reversal of 21444226 is 62244412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15992001 + 5452225 = 3999^2 + 2335^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21444226.

It is not an unprimeable number, because it can be changed into a prime (21444223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2491 + ... + 7006.

Almost surely, 2^21444226 is an apocalyptic number.

21444226 is a deficient number, since it is larger than the sum of its proper divisors (10753994).

21444226 is a wasteful number, since it uses less digits than its factorization.

21444226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10628.

The product of its digits is 3072, while the sum is 25.

The square root of 21444226 is about 4630.7910771271. The cubic root of 21444226 is about 277.8242337354.

Adding to 21444226 its reverse (62244412), we get a palindrome (83688638).

The spelling of 21444226 in words is "twenty-one million, four hundred forty-four thousand, two hundred twenty-six".