21223232 has 14 divisors (see below), whose sum is σ = 42114978. Its totient is φ = 10611584.

The previous prime is 21223219. The next prime is 21223261. The reversal of 21223232 is 23232212.

It can be written as a sum of positive squares in only one way, i.e., 18181696 + 3041536 = 4264^2 + 1744^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21223232.

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 as a sum of consecutive naturals, namely, 165743 + ... + 165870.

Almost surely, 2^21223232 is an apocalyptic number.

It is an amenable number.

21223232 is a deficient number, since it is larger than the sum of its proper divisors (20891746).

21223232 is an equidigital number, since it uses as much as digits as its factorization.

21223232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331625 (or 331615 counting only the distinct ones).

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

The square root of 21223232 is about 4606.8679164916. The cubic root of 21223232 is about 276.8665615597.

Adding to 21223232 its reverse (23232212), we get a palindrome (44455444).

The spelling of 21223232 in words is "twenty-one million, two hundred twenty-three thousand, two hundred thirty-two".