21544232 has 16 divisors (see below), whose sum is σ = 40444800. Its totient is φ = 10758960.

The previous prime is 21544231. The next prime is 21544273. The reversal of 21544232 is 23244512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21544198 and 21544207.

It is not an unprimeable number, because it can be changed into a prime (21544231) 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, 11369 + ... + 13127.

It is an arithmetic number, because the mean of its divisors is an integer number (2527800).

Almost surely, 2^21544232 is an apocalyptic number.

It is an amenable number.

21544232 is a deficient number, since it is larger than the sum of its proper divisors (18900568).

21544232 is a wasteful number, since it uses less digits than its factorization.

21544232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3296 (or 3292 counting only the distinct ones).

The product of its digits is 1920, while the sum is 23.

The square root of 21544232 is about 4641.5764563346. The cubic root of 21544232 is about 278.2554455549.

Adding to 21544232 its reverse (23244512), we get a palindrome (44788744).

The spelling of 21544232 in words is "twenty-one million, five hundred forty-four thousand, two hundred thirty-two".