21066752 has 44 divisors (see below), whose sum is σ = 48145440. Its totient is φ = 9025536.

The previous prime is 21066739. The next prime is 21066769. The reversal of 21066752 is 25766012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5699 + ... + 8637.

Almost surely, 2^21066752 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 21066752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24072720).

21066752 is an abundant number, since it is smaller than the sum of its proper divisors (27078688).

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

21066752 is an equidigital number, since it uses as much as digits as its factorization.

21066752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2966 (or 2948 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 21066752 is about 4589.8531566925. The cubic root of 21066752 is about 276.1844317949.

The spelling of 21066752 in words is "twenty-one million, sixty-six thousand, seven hundred fifty-two".