21163108 has 6 divisors (see below), whose sum is σ = 37035446. Its totient is φ = 10581552.

The previous prime is 21163099. The next prime is 21163133. The reversal of 21163108 is 80136112.

It can be written as a sum of positive squares in only one way, i.e., 12054784 + 9108324 = 3472^2 + 3018^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2645385 + ... + 2645392.

Almost surely, 2^21163108 is an apocalyptic number.

It is an amenable number.

21163108 is a deficient number, since it is larger than the sum of its proper divisors (15872338).

21163108 is a wasteful number, since it uses less digits than its factorization.

21163108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5290781 (or 5290779 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 21163108 is about 4600.3378136828. The cubic root of 21163108 is about 276.6048661176.

The spelling of 21163108 in words is "twenty-one million, one hundred sixty-three thousand, one hundred eight".