21682528 has 24 divisors (see below), whose sum is σ = 48786192. Its totient is φ = 9292416.

The previous prime is 21682519. The next prime is 21682589. The reversal of 21682528 is 82528612.

It is a junction number, because it is equal to n+sod(n) for n = 21682493 and 21682502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48175 + ... + 48622.

It is an arithmetic number, because the mean of its divisors is an integer number (2032758).

Almost surely, 2^21682528 is an apocalyptic number.

21682528 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21682528 is an abundant number, since it is smaller than the sum of its proper divisors (27103664).

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

21682528 is an equidigital number, since it uses as much as digits as its factorization.

21682528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96814 (or 96806 counting only the distinct ones).

The product of its digits is 15360, while the sum is 34.

The square root of 21682528 is about 4656.4501500607. The cubic root of 21682528 is about 278.8495654031.

The spelling of 21682528 in words is "twenty-one million, six hundred eighty-two thousand, five hundred twenty-eight".