21163316746727 has 2 divisors, whose sum is σ = 21163316746728. Its totient is φ = 21163316746726.

The previous prime is 21163316746703. The next prime is 21163316746757. The reversal of 21163316746727 is 72764761336112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21163316746727 - 2¹⁴ = 21163316730343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21163316746757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581658373363 + 10581658373364.

It is an arithmetic number, because the mean of its divisors is an integer number (10581658373364).

Almost surely, 2^{21163316746727} is an apocalyptic number.

21163316746727 is a deficient number, since it is larger than the sum of its proper divisors (1).

21163316746727 is an equidigital number, since it uses as much as digits as its factorization.

21163316746727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10668672, while the sum is 56.

The spelling of 21163316746727 in words is "twenty-one trillion, one hundred sixty-three billion, three hundred sixteen million, seven hundred forty-six thousand, seven hundred twenty-seven".