21010752 has 168 divisors, whose sum is σ = 71745856. Its totient is φ = 5971968.

The previous prime is 21010741. The next prime is 21010757. The reversal of 21010752 is 25701012.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010757) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 108768 + ... + 108960.

Almost surely, 2^21010752 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 21010752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35872928).

21010752 is an abundant number, since it is smaller than the sum of its proper divisors (50735104).

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

21010752 is an equidigital number, since it uses as much as digits as its factorization.

21010752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 21010752 is about 4583.7486842103. The cubic root of 21010752 is about 275.9394952437.

Adding to 21010752 its reverse (25701012), we get a palindrome (46711764).

The spelling of 21010752 in words is "twenty-one million, ten thousand, seven hundred fifty-two".