21423004209263 has 2 divisors, whose sum is σ = 21423004209264. Its totient is φ = 21423004209262.

The previous prime is 21423004209203. The next prime is 21423004209317. The reversal of 21423004209263 is 36290240032412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21423004209263 - 2⁶ = 21423004209199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21423004209203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711502104631 + 10711502104632.

It is an arithmetic number, because the mean of its divisors is an integer number (10711502104632).

Almost surely, 2^{21423004209263} is an apocalyptic number.

21423004209263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423004209263 is an equidigital number, since it uses as much as digits as its factorization.

21423004209263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 21423004209263 in words is "twenty-one trillion, four hundred twenty-three billion, four million, two hundred nine thousand, two hundred sixty-three".