21069528 has 64 divisors (see below), whose sum is σ = 56388960. Its totient is φ = 6537216.

The previous prime is 21069487. The next prime is 21069547. The reversal of 21069528 is 82596012.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 45876 + ... + 46332.

Almost surely, 2^21069528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21069528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28194480).

21069528 is an abundant number, since it is smaller than the sum of its proper divisors (35319432).

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

21069528 is a wasteful number, since it uses less digits than its factorization.

21069528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 21069528 is about 4590.1555529197. The cubic root of 21069528 is about 276.1965623520.

The spelling of 21069528 in words is "twenty-one million, sixty-nine thousand, five hundred twenty-eight".