21332232 has 48 divisors (see below), whose sum is σ = 58441500. Its totient is φ = 7028736.

The previous prime is 21332221. The next prime is 21332251. The reversal of 21332232 is 23223312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20304036 + 1028196 = 4506^2 + 1014^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4744 + ... + 8072.

Almost surely, 2^21332232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21332232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29220750).

21332232 is an abundant number, since it is smaller than the sum of its proper divisors (37109268).

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

21332232 is a wasteful number, since it uses less digits than its factorization.

21332232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3430 (or 3423 counting only the distinct ones).

The product of its digits is 432, while the sum is 18.

The square root of 21332232 is about 4618.6829291477. The cubic root of 21332232 is about 277.3397370214.

Adding to 21332232 its reverse (23223312), we get a palindrome (44555544).

The spelling of 21332232 in words is "twenty-one million, three hundred thirty-two thousand, two hundred thirty-two".