21162224 has 20 divisors (see below), whose sum is σ = 42111144. Its totient is φ = 10294848.

The previous prime is 21162217. The next prime is 21162247. The reversal of 21162224 is 42226112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21162196 and 21162205.

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 3 ways as a sum of consecutive naturals, for example, 17282 + ... + 18465.

Almost surely, 2^21162224 is an apocalyptic number.

It is an amenable number.

21162224 is a deficient number, since it is larger than the sum of its proper divisors (20948920).

21162224 is a wasteful number, since it uses less digits than its factorization.

21162224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35792 (or 35786 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 21162224 is about 4600.2417327788. The cubic root of 21162224 is about 276.6010147282.

Adding to 21162224 its reverse (42226112), we get a palindrome (63388336).

The spelling of 21162224 in words is "twenty-one million, one hundred sixty-two thousand, two hundred twenty-four".