21008110 has 16 divisors (see below), whose sum is σ = 39805200. Its totient is φ = 7960896.

The previous prime is 21008083. The next prime is 21008149. The reversal of 21008110 is 1180012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55095 + ... + 55474.

It is an arithmetic number, because the mean of its divisors is an integer number (2487825).

Almost surely, 2^21008110 is an apocalyptic number.

21008110 is a deficient number, since it is larger than the sum of its proper divisors (18797090).

21008110 is a wasteful number, since it uses less digits than its factorization.

21008110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110595.

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

The square root of 21008110 is about 4583.4604830848. The cubic root of 21008110 is about 275.9279287419.

Adding to 21008110 its reverse (1180012), we get a palindrome (22188122).

The spelling of 21008110 in words is "twenty-one million, eight thousand, one hundred ten".