21303752 has 16 divisors (see below), whose sum is σ = 40394700. Its totient is φ = 10531840.

The previous prime is 21303713. The next prime is 21303757. The reversal of 21303752 is 25730312.

It can be written as a sum of positive squares in 2 ways, for example, as 21104836 + 198916 = 4594^2 + 446^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14249 + ... + 15672.

Almost surely, 2^21303752 is an apocalyptic number.

It is an amenable number.

21303752 is a deficient number, since it is larger than the sum of its proper divisors (19090948).

21303752 is a wasteful number, since it uses less digits than its factorization.

21303752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30016 (or 30012 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 21303752 is about 4615.5987693906. The cubic root of 21303752 is about 277.2162595000.

The spelling of 21303752 in words is "twenty-one million, three hundred three thousand, seven hundred fifty-two".