21272752 has 20 divisors (see below), whose sum is σ = 41387976. Its totient is φ = 10592000.

The previous prime is 21272731. The next prime is 21272759. The reversal of 21272752 is 25727212.

It is a self number, because there is not a number n which added to its sum of digits gives 21272752.

It is not an unprimeable number, because it can be changed into a prime (21272759) 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, 1368 + ... + 6664.

Almost surely, 2^21272752 is an apocalyptic number.

It is an amenable number.

21272752 is a deficient number, since it is larger than the sum of its proper divisors (20115224).

21272752 is a wasteful number, since it uses less digits than its factorization.

21272752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5556 (or 5550 counting only the distinct ones).

The product of its digits is 3920, while the sum is 28.

The square root of 21272752 is about 4612.2393693303. The cubic root of 21272752 is about 277.0817311507.

Adding to 21272752 its reverse (25727212), we get a palindrome (46999964).

The spelling of 21272752 in words is "twenty-one million, two hundred seventy-two thousand, seven hundred fifty-two".