21404330093 has 2 divisors, whose sum is σ = 21404330094. Its totient is φ = 21404330092.

The previous prime is 21404330021. The next prime is 21404330111. The reversal of 21404330093 is 39003340412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14825984644 + 6578345449 = 121762^2 + 81107^2 .

It is a cyclic number.

It is not a de Polignac number, because 21404330093 - 2²⁰ = 21403281517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21404330993) 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, 10702165046 + 10702165047.

It is an arithmetic number, because the mean of its divisors is an integer number (10702165047).

Almost surely, 2^21404330093 is an apocalyptic number.

It is an amenable number.

21404330093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404330093 is an equidigital number, since it uses as much as digits as its factorization.

21404330093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

The spelling of 21404330093 in words is "twenty-one billion, four hundred four million, three hundred thirty thousand, ninety-three".