21404104103 has 2 divisors, whose sum is σ = 21404104104. Its totient is φ = 21404104102.

The previous prime is 21404104097. The next prime is 21404104121. The reversal of 21404104103 is 30140140412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21404104103 - 2⁴ = 21404104087 is a prime.

It is a super-2 number, since 2×21404104103² (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 (21404104003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702052051 + 10702052052.

It is an arithmetic number, because the mean of its divisors is an integer number (10702052052).

Almost surely, 2^21404104103 is an apocalyptic number.

21404104103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404104103 is an equidigital number, since it uses as much as digits as its factorization.

21404104103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21404104103 its reverse (30140140412), we get a palindrome (51544244515).

The spelling of 21404104103 in words is "twenty-one billion, four hundred four million, one hundred four thousand, one hundred three".