21682648 has 32 divisors (see below), whose sum is σ = 46090800. Its totient is φ = 9479808.

The previous prime is 21682643. The next prime is 21682657. The reversal of 21682648 is 84628612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21682643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3511 + ... + 7462.

Almost surely, 2^21682648 is an apocalyptic number.

It is an amenable number.

21682648 is an abundant number, since it is smaller than the sum of its proper divisors (24408152).

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

21682648 is a wasteful number, since it uses less digits than its factorization.

21682648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11011 (or 11007 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 21682648 is about 4656.4630353950. The cubic root of 21682648 is about 278.8500798247.

The spelling of 21682648 in words is "twenty-one million, six hundred eighty-two thousand, six hundred forty-eight".