21441544 has 16 divisors (see below), whose sum is σ = 40885200. Its totient is φ = 10538832.

The previous prime is 21441533. The next prime is 21441551. The reversal of 21441544 is 44514412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22242 + ... + 23185.

It is an arithmetic number, because the mean of its divisors is an integer number (2555325).

Almost surely, 2^21441544 is an apocalyptic number.

It is an amenable number.

21441544 is a deficient number, since it is larger than the sum of its proper divisors (19443656).

21441544 is a wasteful number, since it uses less digits than its factorization.

21441544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45492 (or 45488 counting only the distinct ones).

The product of its digits is 2560, while the sum is 25.

The square root of 21441544 is about 4630.5014847206. The cubic root of 21441544 is about 277.8126508869.

Adding to 21441544 its reverse (44514412), we get a palindrome (65955956).

The spelling of 21441544 in words is "twenty-one million, four hundred forty-one thousand, five hundred forty-four".