21222422 has 24 divisors (see below), whose sum is σ = 35860944. Its totient is φ = 9363024.

The previous prime is 21222401. The next prime is 21222433. The reversal of 21222422 is 22422212.

It is a self number, because there is not a number n which added to its sum of digits gives 21222422.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 12983 + ... + 14525.

It is an arithmetic number, because the mean of its divisors is an integer number (1494206).

Almost surely, 2^21222422 is an apocalyptic number.

21222422 is a deficient number, since it is larger than the sum of its proper divisors (14638522).

21222422 is a wasteful number, since it uses less digits than its factorization.

21222422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604 (or 1581 counting only the distinct ones).

The product of its digits is 256, while the sum is 17.

The square root of 21222422 is about 4606.7800034297. The cubic root of 21222422 is about 276.8630392440.

Adding to 21222422 its reverse (22422212), we get a palindrome (43644634).

The spelling of 21222422 in words is "twenty-one million, two hundred twenty-two thousand, four hundred twenty-two".