21244222 has 8 divisors (see below), whose sum is σ = 31886496. Its totient is φ = 10615392.

The previous prime is 21244219. The next prime is 21244229. The reversal of 21244222 is 22244212.

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 21244222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244229) 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, 2998 + ... + 7174.

It is an arithmetic number, because the mean of its divisors is an integer number (3985812).

Almost surely, 2^21244222 is an apocalyptic number.

21244222 is a deficient number, since it is larger than the sum of its proper divisors (10642274).

21244222 is a wasteful number, since it uses less digits than its factorization.

21244222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6722.

The product of its digits is 512, while the sum is 19.

The square root of 21244222 is about 4609.1454739463. The cubic root of 21244222 is about 276.9578061343.

Adding to 21244222 its reverse (22244212), we get a palindrome (43488434).

The spelling of 21244222 in words is "twenty-one million, two hundred forty-four thousand, two hundred twenty-two".