21279732723719 has 2 divisors, whose sum is σ = 21279732723720. Its totient is φ = 21279732723718.

The previous prime is 21279732723709. The next prime is 21279732723721. The reversal of 21279732723719 is 91732723797212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21279732723719 - 2⁴⁰ = 20180221095943 is a prime.

It is a super-2 number, since 2×21279732723719² (a number of 27 digits) contains 22 as substring.

Together with 21279732723721, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21279732723709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10639866361859 + 10639866361860.

It is an arithmetic number, because the mean of its divisors is an integer number (10639866361860).

Almost surely, 2^{21279732723719} is an apocalyptic number.

21279732723719 is a deficient number, since it is larger than the sum of its proper divisors (1).

21279732723719 is an equidigital number, since it uses as much as digits as its factorization.

21279732723719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28005264, while the sum is 62.

The spelling of 21279732723719 in words is "twenty-one trillion, two hundred seventy-nine billion, seven hundred thirty-two million, seven hundred twenty-three thousand, seven hundred nineteen".