21382108 has 36 divisors (see below), whose sum is σ = 41845608. Its totient is φ = 9480640.

The previous prime is 21382103. The next prime is 21382121. The reversal of 21382108 is 80128312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21382103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123510 + ... + 123682.

It is an arithmetic number, because the mean of its divisors is an integer number (1162378).

Almost surely, 2^21382108 is an apocalyptic number.

It is an amenable number.

21382108 is a deficient number, since it is larger than the sum of its proper divisors (20463500).

21382108 is a wasteful number, since it uses less digits than its factorization.

21382108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 21382108 is about 4624.0791515717. The cubic root of 21382108 is about 277.5557142686. Note that the first 3 decimals are identical.

The spelling of 21382108 in words is "twenty-one million, three hundred eighty-two thousand, one hundred eight".