21716163 has 36 divisors (see below), whose sum is σ = 38093328. Its totient is φ = 11864160.

The previous prime is 21716159. The next prime is 21716237. The reversal of 21716163 is 36161712.

It is not a de Polignac number, because 21716163 - 2² = 21716159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21716143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9073 + ... + 11213.

It is an arithmetic number, because the mean of its divisors is an integer number (1058148).

Almost surely, 2^21716163 is an apocalyptic number.

21716163 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21716163 is a deficient number, since it is larger than the sum of its proper divisors (16377165).

21716163 is a wasteful number, since it uses less digits than its factorization.

21716163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184 (or 2174 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 21716163 is about 4660.0604073338. The cubic root of 21716163 is about 278.9936792802.

Adding to 21716163 its reverse (36161712), we get a palindrome (57877875).

The spelling of 21716163 in words is "twenty-one million, seven hundred sixteen thousand, one hundred sixty-three".