21441232 has 20 divisors (see below), whose sum is σ = 42070720. Its totient is φ = 10584288.

The previous prime is 21441229. The next prime is 21441239. The reversal of 21441232 is 23214412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441239) 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, 7218 + ... + 9745.

It is an arithmetic number, because the mean of its divisors is an integer number (2103536).

Almost surely, 2^21441232 is an apocalyptic number.

It is an amenable number.

21441232 is a deficient number, since it is larger than the sum of its proper divisors (20629488).

21441232 is a wasteful number, since it uses less digits than its factorization.

21441232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17050 (or 17044 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 21441232 is about 4630.4677949425. The cubic root of 21441232 is about 277.8113033787.

Adding to 21441232 its reverse (23214412), we get a palindrome (44655644).

The spelling of 21441232 in words is "twenty-one million, four hundred forty-one thousand, two hundred thirty-two".