21104041 has 16 divisors (see below), whose sum is σ = 26496000. Its totient is φ = 16389648.

The previous prime is 21104033. The next prime is 21104059. The reversal of 21104041 is 14040112.

It is a cyclic number.

It is not a de Polignac number, because 21104041 - 2³ = 21104033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21104011) 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, 391 + ... + 6508.

It is an arithmetic number, because the mean of its divisors is an integer number (1656000).

Almost surely, 2^21104041 is an apocalyptic number.

It is an amenable number.

21104041 is a deficient number, since it is larger than the sum of its proper divisors (5391959).

21104041 is a wasteful number, since it uses less digits than its factorization.

21104041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6948.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21104041 is about 4593.9134732818. The cubic root of 21104041 is about 276.3472882699.

Adding to 21104041 its reverse (14040112), we get a palindrome (35144153).

The spelling of 21104041 in words is "twenty-one million, one hundred four thousand, forty-one".