21104444111 has 2 divisors, whose sum is σ = 21104444112. Its totient is φ = 21104444110.

The previous prime is 21104444093. The next prime is 21104444131. The reversal of 21104444111 is 11144440112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21104444111 is a prime.

It is a super-2 number, since 2×21104444111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21104444131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552222055 + 10552222056.

It is an arithmetic number, because the mean of its divisors is an integer number (10552222056).

Almost surely, 2^21104444111 is an apocalyptic number.

21104444111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104444111 is an equidigital number, since it uses as much as digits as its factorization.

21104444111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 21104444111 its reverse (11144440112), we get a palindrome (32248884223).

The spelling of 21104444111 in words is "twenty-one billion, one hundred four million, four hundred forty-four thousand, one hundred eleven".