21965952163 has 2 divisors, whose sum is σ = 21965952164. Its totient is φ = 21965952162.

The previous prime is 21965952157. The next prime is 21965952221. The reversal of 21965952163 is 36125956912.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21965952163 is a prime.

It is not a weakly prime, because it can be changed into another prime (21965956163) 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, 10982976081 + 10982976082.

It is an arithmetic number, because the mean of its divisors is an integer number (10982976082).

Almost surely, 2^21965952163 is an apocalyptic number.

21965952163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21965952163 is an equidigital number, since it uses as much as digits as its factorization.

21965952163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 49.

The spelling of 21965952163 in words is "twenty-one billion, nine hundred sixty-five million, nine hundred fifty-two thousand, one hundred sixty-three".