21373660660063 has 2 divisors, whose sum is σ = 21373660660064. Its totient is φ = 21373660660062.

The previous prime is 21373660660039. The next prime is 21373660660069. The reversal of 21373660660063 is 36006606637312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21373660660063 - 2²⁵ = 21373627105631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21373660659989 and 21373660660016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21373660660069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10686830330031 + 10686830330032.

It is an arithmetic number, because the mean of its divisors is an integer number (10686830330032).

Almost surely, 2^{21373660660063} is an apocalyptic number.

21373660660063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21373660660063 is an equidigital number, since it uses as much as digits as its factorization.

21373660660063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 49.

The spelling of 21373660660063 in words is "twenty-one trillion, three hundred seventy-three billion, six hundred sixty million, six hundred sixty thousand, sixty-three".