21441071 has 4 divisors (see below), whose sum is σ = 21897312. Its totient is φ = 20984832.

The previous prime is 21441031. The next prime is 21441089. The reversal of 21441071 is 17014412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21441071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441001) 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, 228050 + ... + 228143.

It is an arithmetic number, because the mean of its divisors is an integer number (5474328).

Almost surely, 2^21441071 is an apocalyptic number.

21441071 is a deficient number, since it is larger than the sum of its proper divisors (456241).

21441071 is an equidigital number, since it uses as much as digits as its factorization.

21441071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456240.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 21441071 is about 4630.4504100573. The cubic root of 21441071 is about 277.8106080249.

Adding to 21441071 its reverse (17014412), we get a palindrome (38455483).

The spelling of 21441071 in words is "twenty-one million, four hundred forty-one thousand, seventy-one".