21698182063 has 2 divisors, whose sum is σ = 21698182064. Its totient is φ = 21698182062.

The previous prime is 21698182049. The next prime is 21698182081. The reversal of 21698182063 is 36028189612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21698182063 - 2²⁵ = 21664627631 is a prime.

It is a super-2 number, since 2×21698182063² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21698182013) 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, 10849091031 + 10849091032.

It is an arithmetic number, because the mean of its divisors is an integer number (10849091032).

Almost surely, 2^21698182063 is an apocalyptic number.

21698182063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21698182063 is an equidigital number, since it uses as much as digits as its factorization.

21698182063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 21698182063 in words is "twenty-one billion, six hundred ninety-eight million, one hundred eighty-two thousand, sixty-three".