21423041093 has 2 divisors, whose sum is σ = 21423041094. Its totient is φ = 21423041092.

The previous prime is 21423041089. The next prime is 21423041099. The reversal of 21423041093 is 39014032412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19698964609 + 1724076484 = 140353^2 + 41522^2 .

It is a cyclic number.

It is not a de Polignac number, because 21423041093 - 2² = 21423041089 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21423041099) 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, 10711520546 + 10711520547.

It is an arithmetic number, because the mean of its divisors is an integer number (10711520547).

Almost surely, 2^21423041093 is an apocalyptic number.

It is an amenable number.

21423041093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423041093 is an equidigital number, since it uses as much as digits as its factorization.

21423041093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 21423041093 in words is "twenty-one billion, four hundred twenty-three million, forty-one thousand, ninety-three".