21163315256273 has 2 divisors, whose sum is σ = 21163315256274. Its totient is φ = 21163315256272.

The previous prime is 21163315256269. The next prime is 21163315256339. The reversal of 21163315256273 is 37265251336112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17166006803344 + 3997308452929 = 4143188^2 + 1999327^2 .

It is a cyclic number.

It is not a de Polignac number, because 21163315256273 - 2² = 21163315256269 is a prime.

It is not a weakly prime, because it can be changed into another prime (21163315256773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581657628136 + 10581657628137.

It is an arithmetic number, because the mean of its divisors is an integer number (10581657628137).

Almost surely, 2^{21163315256273} is an apocalyptic number.

It is an amenable number.

21163315256273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21163315256273 is an equidigital number, since it uses as much as digits as its factorization.

21163315256273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 47.

The spelling of 21163315256273 in words is "twenty-one trillion, one hundred sixty-three billion, three hundred fifteen million, two hundred fifty-six thousand, two hundred seventy-three".