21104134039 has 2 divisors, whose sum is σ = 21104134040. Its totient is φ = 21104134038.

The previous prime is 21104134001. The next prime is 21104134141. The reversal of 21104134039 is 93043140112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21104134039 - 2¹⁷ = 21104002967 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21104133998 and 21104134016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21104134739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552067019 + 10552067020.

It is an arithmetic number, because the mean of its divisors is an integer number (10552067020).

Almost surely, 2^21104134039 is an apocalyptic number.

21104134039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104134039 is an equidigital number, since it uses as much as digits as its factorization.

21104134039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 21104134039 in words is "twenty-one billion, one hundred four million, one hundred thirty-four thousand, thirty-nine".