21045752 has 32 divisors (see below), whose sum is σ = 48568800. Its totient is φ = 8325504.

The previous prime is 21045737. The next prime is 21045757. The reversal of 21045752 is 25754012.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21045757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13727 + ... + 15182.

It is an arithmetic number, because the mean of its divisors is an integer number (1517775).

Almost surely, 2^21045752 is an apocalyptic number.

It is an amenable number.

21045752 is an abundant number, since it is smaller than the sum of its proper divisors (27523048).

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

21045752 is a wasteful number, since it uses less digits than its factorization.

21045752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28935 (or 28931 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 21045752 is about 4587.5649314206. The cubic root of 21045752 is about 276.0926315133.

Adding to 21045752 its reverse (25754012), we get a palindrome (46799764).

The spelling of 21045752 in words is "twenty-one million, forty-five thousand, seven hundred fifty-two".