21708326636023 has 2 divisors, whose sum is σ = 21708326636024. Its totient is φ = 21708326636022.

The previous prime is 21708326635997. The next prime is 21708326636041. The reversal of 21708326636023 is 32063662380712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21708326636023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21708326636123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10854163318011 + 10854163318012.

It is an arithmetic number, because the mean of its divisors is an integer number (10854163318012).

Almost surely, 2^{21708326636023} is an apocalyptic number.

21708326636023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21708326636023 is an equidigital number, since it uses as much as digits as its factorization.

21708326636023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 49.

The spelling of 21708326636023 in words is "twenty-one trillion, seven hundred eight billion, three hundred twenty-six million, six hundred thirty-six thousand, twenty-three".