21163118 has 8 divisors (see below), whose sum is σ = 31765440. Its totient is φ = 10574640.

The previous prime is 21163099. The next prime is 21163133. The reversal of 21163118 is 81136112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21163093 and 21163102.

It is a congruent number.

It is an unprimeable number.

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, 2243 + ... + 6881.

It is an arithmetic number, because the mean of its divisors is an integer number (3970680).

Almost surely, 2^21163118 is an apocalyptic number.

21163118 is a deficient number, since it is larger than the sum of its proper divisors (10602322).

21163118 is a wasteful number, since it uses less digits than its factorization.

21163118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6922.

The product of its digits is 288, while the sum is 23.

The square root of 21163118 is about 4600.3389005594. The cubic root of 21163118 is about 276.6049096847.

The spelling of 21163118 in words is "twenty-one million, one hundred sixty-three thousand, one hundred eighteen".