21441043 has 4 divisors (see below), whose sum is σ = 23090368. Its totient is φ = 19791720.

The previous prime is 21441031. The next prime is 21441089. The reversal of 21441043 is 34014412.

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

It is not a de Polignac number, because 21441043 - 2⁵ = 21441011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21441043.

It is not an unprimeable number, because it can be changed into a prime (21444043) 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, 824643 + ... + 824668.

It is an arithmetic number, because the mean of its divisors is an integer number (5772592).

Almost surely, 2^21441043 is an apocalyptic number.

21441043 is a deficient number, since it is larger than the sum of its proper divisors (1649325).

21441043 is a wasteful number, since it uses less digits than its factorization.

21441043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649324.

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

The square root of 21441043 is about 4630.4473865924. The cubic root of 21441043 is about 277.8104870934.

Adding to 21441043 its reverse (34014412), we get a palindrome (55455455).

The spelling of 21441043 in words is "twenty-one million, four hundred forty-one thousand, forty-three".