21441443 has 4 divisors (see below), whose sum is σ = 22569960. Its totient is φ = 20312928.

The previous prime is 21441421. The next prime is 21441449. The reversal of 21441443 is 34414412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21441443 - 2¹² = 21437347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21441449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564230 + ... + 564267.

It is an arithmetic number, because the mean of its divisors is an integer number (5642490).

Almost surely, 2^21441443 is an apocalyptic number.

21441443 is a deficient number, since it is larger than the sum of its proper divisors (1128517).

21441443 is a wasteful number, since it uses less digits than its factorization.

21441443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128516.

The product of its digits is 1536, while the sum is 23.

The square root of 21441443 is about 4630.4905787616. The cubic root of 21441443 is about 277.8122146758.

Adding to 21441443 its reverse (34414412), we get a palindrome (55855855).

The spelling of 21441443 in words is "twenty-one million, four hundred forty-one thousand, four hundred forty-three".