21104134111 has 4 divisors (see below), whose sum is σ = 21674516152. Its totient is φ = 20533752072.

The previous prime is 21104134039. The next prime is 21104134141. The reversal of 21104134111 is 11143140112.

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 21104134111 - 2⁹ = 21104133599 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 (21104134141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285190965 + ... + 285191038.

It is an arithmetic number, because the mean of its divisors is an integer number (5418629038).

Almost surely, 2^21104134111 is an apocalyptic number.

21104134111 is a deficient number, since it is larger than the sum of its proper divisors (570382041).

21104134111 is an equidigital number, since it uses as much as digits as its factorization.

21104134111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570382040.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21104134111 its reverse (11143140112), we get a palindrome (32247274223).

The spelling of 21104134111 in words is "twenty-one billion, one hundred four million, one hundred thirty-four thousand, one hundred eleven".