21110008 has 16 divisors (see below), whose sum is σ = 40858560. Its totient is φ = 10214400.

The previous prime is 21109987. The next prime is 21110027. The reversal of 21110008 is 80001112.

It is a self number, because there is not a number n which added to its sum of digits gives 21110008.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 42313 + ... + 42808.

It is an arithmetic number, because the mean of its divisors is an integer number (2553660).

Almost surely, 2^21110008 is an apocalyptic number.

It is an amenable number.

21110008 is a deficient number, since it is larger than the sum of its proper divisors (19748552).

21110008 is a wasteful number, since it uses less digits than its factorization.

21110008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85158 (or 85154 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 21110008 is about 4594.5628736584. The cubic root of 21110008 is about 276.3733308160.

The spelling of 21110008 in words is "twenty-one million, one hundred ten thousand, eight".