21040752 has 40 divisors (see below), whose sum is σ = 57218560. Its totient is φ = 6644160.

The previous prime is 21040741. The next prime is 21040759. The reversal of 21040752 is 25704012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040759) 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, 10624 + ... + 12447.

It is an arithmetic number, because the mean of its divisors is an integer number (1430464).

Almost surely, 2^21040752 is an apocalyptic number.

It is an amenable number.

21040752 is an abundant number, since it is smaller than the sum of its proper divisors (36177808).

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

21040752 is a wasteful number, since it uses less digits than its factorization.

21040752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23101 (or 23095 counting only the distinct ones).

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

The square root of 21040752 is about 4587.0199476348. The cubic root of 21040752 is about 276.0707653034.

Adding to 21040752 its reverse (25704012), we get a palindrome (46744764).

The spelling of 21040752 in words is "twenty-one million, forty thousand, seven hundred fifty-two".