21713569439423 has 2 divisors, whose sum is σ = 21713569439424. Its totient is φ = 21713569439422.

The previous prime is 21713569439377. The next prime is 21713569439449. The reversal of 21713569439423 is 32493496531712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21713569439423 - 2⁸ = 21713569439167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21713569439473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10856784719711 + 10856784719712.

It is an arithmetic number, because the mean of its divisors is an integer number (10856784719712).

Almost surely, 2^{21713569439423} is an apocalyptic number.

21713569439423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21713569439423 is an equidigital number, since it uses as much as digits as its factorization.

21713569439423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29393280, while the sum is 59.

The spelling of 21713569439423 in words is "twenty-one trillion, seven hundred thirteen billion, five hundred sixty-nine million, four hundred thirty-nine thousand, four hundred twenty-three".