21198782163 has 32 divisors (see below), whose sum is σ = 33434472960. Its totient is φ = 11821455360.

The previous prime is 21198782161. The next prime is 21198782177. The reversal of 21198782163 is 36128789112.

It is not a de Polignac number, because 21198782163 - 2¹ = 21198782161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21198782161) 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 in 31 ways as a sum of consecutive naturals, for example, 604878 + ... + 638963.

It is an arithmetic number, because the mean of its divisors is an integer number (1044827280).

Almost surely, 2^21198782163 is an apocalyptic number.

21198782163 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21198782163 is a deficient number, since it is larger than the sum of its proper divisors (12235690797).

21198782163 is a wasteful number, since it uses less digits than its factorization.

21198782163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243899.

The product of its digits is 290304, while the sum is 48.

The spelling of 21198782163 in words is "twenty-one billion, one hundred ninety-eight million, seven hundred eighty-two thousand, one hundred sixty-three".