21404113079 has 2 divisors, whose sum is σ = 21404113080. Its totient is φ = 21404113078.

The previous prime is 21404113063. The next prime is 21404113097. The reversal of 21404113079 is 97031140412.

Together with next prime (21404113097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21404113079 - 2⁴ = 21404113063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21404113009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702056539 + 10702056540.

It is an arithmetic number, because the mean of its divisors is an integer number (10702056540).

Almost surely, 2^21404113079 is an apocalyptic number.

21404113079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404113079 is an equidigital number, since it uses as much as digits as its factorization.

21404113079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 21404113079 in words is "twenty-one billion, four hundred four million, one hundred thirteen thousand, seventy-nine".