21441005 has 16 divisors (see below), whose sum is σ = 27025920. Its totient is φ = 16306752.

The previous prime is 21441001. The next prime is 21441011. The reversal of 21441005 is 50014412.

It is a cyclic number.

It is not a de Polignac number, because 21441005 - 2² = 21441001 is a prime.

It is a Curzon 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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8612 + ... + 10818.

It is an arithmetic number, because the mean of its divisors is an integer number (1689120).

Almost surely, 2^21441005 is an apocalyptic number.

It is an amenable number.

21441005 is a deficient number, since it is larger than the sum of its proper divisors (5584915).

21441005 is a wasteful number, since it uses less digits than its factorization.

21441005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21441005 is about 4630.4432833153. The cubic root of 21441005 is about 277.8103229720.

Adding to 21441005 its reverse (50014412), we get a palindrome (71455417).

The spelling of 21441005 in words is "twenty-one million, four hundred forty-one thousand, five".