21486528 has 126 divisors (see below), whose sum is σ = 71362824. Its totient is φ = 6054912.

The previous prime is 21486527. The next prime is 21486539. The reversal of 21486528 is 82568412.

It is a tau number, because it is divible by the number of its divisors (126).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21486492 and 21486501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21486523) 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 17 ways as a sum of consecutive naturals, for example, 294300 + ... + 294372.

Almost surely, 2^21486528 is an apocalyptic number.

21486528 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21486528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35681412).

21486528 is an abundant number, since it is smaller than the sum of its proper divisors (49876296).

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

21486528 is an equidigital number, since it uses as much as digits as its factorization.

21486528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 85 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 21486528 is about 4635.3562969852. The cubic root of 21486528 is about 278.0067972735.

The spelling of 21486528 in words is "twenty-one million, four hundred eighty-six thousand, five hundred twenty-eight".