21232232 has 16 divisors (see below), whose sum is σ = 45497760. Its totient is φ = 9099504.

The previous prime is 21232229. The next prime is 21232247. The reversal of 21232232 is 23223212.

It is a self number, because there is not a number n which added to its sum of digits gives 21232232.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189518 + ... + 189629.

It is an arithmetic number, because the mean of its divisors is an integer number (2843610).

Almost surely, 2^21232232 is an apocalyptic number.

It is an amenable number.

21232232 is an abundant number, since it is smaller than the sum of its proper divisors (24265528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232232 is a wasteful number, since it uses less digits than its factorization.

21232232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379160 (or 379156 counting only the distinct ones).

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

The square root of 21232232 is about 4607.8446154357. The cubic root of 21232232 is about 276.9056923718.

Adding to 21232232 its reverse (23223212), we get a palindrome (44455444).

The spelling of 21232232 in words is "twenty-one million, two hundred thirty-two thousand, two hundred thirty-two".