21008682 has 24 divisors (see below), whose sum is σ = 46579104. Its totient is φ = 6839784.

The previous prime is 21008681. The next prime is 21008749. The reversal of 21008682 is 28680012.

It is not an unprimeable number, because it can be changed into a prime (21008681) 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, 12798 + ... + 14345.

It is an arithmetic number, because the mean of its divisors is an integer number (1940796).

Almost surely, 2^21008682 is an apocalyptic number.

21008682 is an abundant number, since it is smaller than the sum of its proper divisors (25570422).

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

21008682 is a wasteful number, since it uses less digits than its factorization.

21008682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27194 (or 27191 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 21008682 is about 4583.5228809290. The cubic root of 21008682 is about 275.9304330024.

Adding to 21008682 its reverse (28680012), we get a palindrome (49688694).

The spelling of 21008682 in words is "twenty-one million, eight thousand, six hundred eighty-two".