21444222 has 8 divisors (see below), whose sum is σ = 42888456. Its totient is φ = 7148072.

The previous prime is 21444193. The next prime is 21444223. The reversal of 21444222 is 22244412.

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

21444222 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444223) 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, 1787013 + ... + 1787024.

It is an arithmetic number, because the mean of its divisors is an integer number (5361057).

Almost surely, 2^21444222 is an apocalyptic number.

21444222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21444222 is a wasteful number, since it uses less digits than its factorization.

21444222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3574042.

The product of its digits is 1024, while the sum is 21.

The square root of 21444222 is about 4630.7906452354. The cubic root of 21444222 is about 277.8242164612.

Adding to 21444222 its reverse (22244412), we get a palindrome (43688634).

The spelling of 21444222 in words is "twenty-one million, four hundred forty-four thousand, two hundred twenty-two".