21224422 has 8 divisors (see below), whose sum is σ = 32013072. Its totient is φ = 10553400.

The previous prime is 21224389. The next prime is 21224431. The reversal of 21224422 is 22442212.

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 21224422.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28954 + ... + 29677.

It is an arithmetic number, because the mean of its divisors is an integer number (4001634).

Almost surely, 2^21224422 is an apocalyptic number.

21224422 is a deficient number, since it is larger than the sum of its proper divisors (10788650).

21224422 is a wasteful number, since it uses less digits than its factorization.

21224422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58814.

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

The square root of 21224422 is about 4606.9970696756. The cubic root of 21224422 is about 276.8717361572.

Adding to 21224422 its reverse (22442212), we get a palindrome (43666634).

The spelling of 21224422 in words is "twenty-one million, two hundred twenty-four thousand, four hundred twenty-two".