21115108 has 12 divisors (see below), whose sum is σ = 42230272. Its totient is φ = 9049320.

The previous prime is 21115093. The next prime is 21115141. The reversal of 21115108 is 80151112.

It is a happy number.

21115108 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377028 + ... + 377083.

Almost surely, 2^21115108 is an apocalyptic number.

21115108 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21115108 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21115108 is a wasteful number, since it uses less digits than its factorization.

21115108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754122 (or 754120 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 21115108 is about 4595.1178439731. The cubic root of 21115108 is about 276.3955855130.

The spelling of 21115108 in words is "twenty-one million, one hundred fifteen thousand, one hundred eight".