21211020163 has 2 divisors, whose sum is σ = 21211020164. Its totient is φ = 21211020162.

The previous prime is 21211020133. The next prime is 21211020191. The reversal of 21211020163 is 36102011212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21211020163 - 2⁹ = 21211019651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21211020163.

It is not a weakly prime, because it can be changed into another prime (21211020133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605510081 + 10605510082.

It is an arithmetic number, because the mean of its divisors is an integer number (10605510082).

Almost surely, 2^21211020163 is an apocalyptic number.

21211020163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211020163 is an equidigital number, since it uses as much as digits as its factorization.

21211020163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21211020163 its reverse (36102011212), we get a palindrome (57313031375).

The spelling of 21211020163 in words is "twenty-one billion, two hundred eleven million, twenty thousand, one hundred sixty-three".