21444232 has 16 divisors (see below), whose sum is σ = 40357260. Its totient is φ = 10682304.

The previous prime is 21444223. The next prime is 21444233. The reversal of 21444232 is 23244412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21288996 + 155236 = 4614^2 + 394^2 .

It is not an unprimeable number, because it can be changed into a prime (21444233) by changing a digit.

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, 2623 + ... + 7054.

Almost surely, 2^21444232 is an apocalyptic number.

It is an amenable number.

21444232 is a deficient number, since it is larger than the sum of its proper divisors (18913028).

21444232 is a wasteful number, since it uses less digits than its factorization.

21444232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9960 (or 9956 counting only the distinct ones).

The product of its digits is 1536, while the sum is 22.

The square root of 21444232 is about 4630.7917249645. The cubic root of 21444232 is about 277.8242596467.

Adding to 21444232 its reverse (23244412), we get a palindrome (44688644).

The spelling of 21444232 in words is "twenty-one million, four hundred forty-four thousand, two hundred thirty-two".