21004752 has 40 divisors (see below), whose sum is σ = 55733536. Its totient is φ = 6811776.

The previous prime is 21004721. The next prime is 21004771. The reversal of 21004752 is 25740012.

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 7 ways as a sum of consecutive naturals, for example, 4138 + ... + 7689.

Almost surely, 2^21004752 is an apocalyptic number.

It is an amenable number.

21004752 is an abundant number, since it is smaller than the sum of its proper divisors (34728784).

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

21004752 is a wasteful number, since it uses less digits than its factorization.

21004752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11875 (or 11869 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 21004752 is about 4583.0941513349. The cubic root of 21004752 is about 275.9132262396.

Adding to 21004752 its reverse (25740012), we get a palindrome (46744764).

The spelling of 21004752 in words is "twenty-one million, four thousand, seven hundred fifty-two".