21163117 has 4 divisors (see below), whose sum is σ = 21172320. Its totient is φ = 21153916.

The previous prime is 21163099. The next prime is 21163133. The reversal of 21163117 is 71136112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21163117 - 2⁷ = 21162989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163187) 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 3 ways as a sum of consecutive naturals, for example, 2184 + ... + 6862.

It is an arithmetic number, because the mean of its divisors is an integer number (5293080).

Almost surely, 2^21163117 is an apocalyptic number.

It is an amenable number.

21163117 is a deficient number, since it is larger than the sum of its proper divisors (9203).

21163117 is an equidigital number, since it uses as much as digits as its factorization.

21163117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9202.

The product of its digits is 252, while the sum is 22.

The square root of 21163117 is about 4600.3387918717. The cubic root of 21163117 is about 276.6049053280.

Adding to 21163117 its reverse (71136112), we get a palindrome (92299229).

The spelling of 21163117 in words is "twenty-one million, one hundred sixty-three thousand, one hundred seventeen".