21823222 has 8 divisors (see below), whose sum is σ = 32817672. Its totient is φ = 10884000.

The previous prime is 21823211. The next prime is 21823247. The reversal of 21823222 is 22232812.

It is a happy number.

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

It is a super-2 number, since 2×21823222² = 952506036922568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21823193 and 21823202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12804 + ... + 14407.

It is an arithmetic number, because the mean of its divisors is an integer number (4102209).

Almost surely, 2^21823222 is an apocalyptic number.

21823222 is a deficient number, since it is larger than the sum of its proper divisors (10994450).

21823222 is a wasteful number, since it uses less digits than its factorization.

21823222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27614.

The product of its digits is 768, while the sum is 22.

The square root of 21823222 is about 4671.5331530452. The cubic root of 21823222 is about 279.4514003289.

The spelling of 21823222 in words is "twenty-one million, eight hundred twenty-three thousand, two hundred twenty-two".