21572752 has 40 divisors (see below), whose sum is σ = 45532800. Its totient is φ = 9862272.

The previous prime is 21572729. The next prime is 21572753. The reversal of 21572752 is 25727512.

It is not an unprimeable number, because it can be changed into a prime (21572753) 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, 7593 + ... + 10039.

It is an arithmetic number, because the mean of its divisors is an integer number (1138320).

Almost surely, 2^21572752 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21572752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22766400).

21572752 is an abundant number, since it is smaller than the sum of its proper divisors (23960048).

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

21572752 is a wasteful number, since it uses less digits than its factorization.

21572752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2503 (or 2497 counting only the distinct ones).

The product of its digits is 9800, while the sum is 31.

The square root of 21572752 is about 4644.6476723213. The cubic root of 21572752 is about 278.3781751729.

The spelling of 21572752 in words is "twenty-one million, five hundred seventy-two thousand, seven hundred fifty-two".