21222332 has 12 divisors (see below), whose sum is σ = 37203600. Its totient is φ = 10592736.

The previous prime is 21222293. The next prime is 21222343. The reversal of 21222332 is 23322212.

It is a self number, because there is not a number n which added to its sum of digits gives 21222332.

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, 1832 + ... + 6767.

It is an arithmetic number, because the mean of its divisors is an integer number (3100300).

Almost surely, 2^21222332 is an apocalyptic number.

It is an amenable number.

21222332 is a deficient number, since it is larger than the sum of its proper divisors (15981268).

21222332 is a wasteful number, since it uses less digits than its factorization.

21222332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9220 (or 9218 counting only the distinct ones).

The product of its digits is 288, while the sum is 17.

The square root of 21222332 is about 4606.7702352082. The cubic root of 21222332 is about 276.8626478701.

Adding to 21222332 its reverse (23322212), we get a palindrome (44544544).

The spelling of 21222332 in words is "twenty-one million, two hundred twenty-two thousand, three hundred thirty-two".