21825152 has 16 divisors (see below), whose sum is σ = 43480050. Its totient is φ = 10912512.

The previous prime is 21825151. The next prime is 21825163. The reversal of 21825152 is 25152812.

It can be written as a sum of positive squares in only one way, i.e., 15555136 + 6270016 = 3944^2 + 2504^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (21825151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85127 + ... + 85382.

Almost surely, 2^21825152 is an apocalyptic number.

It is an amenable number.

21825152 is a deficient number, since it is larger than the sum of its proper divisors (21654898).

21825152 is an equidigital number, since it uses as much as digits as its factorization.

21825152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170523 (or 170511 counting only the distinct ones).

The product of its digits is 1600, while the sum is 26.

The square root of 21825152 is about 4671.7397187771. The cubic root of 21825152 is about 279.4596381181.

Adding to 21825152 its reverse (25152812), we get a palindrome (46977964).

The spelling of 21825152 in words is "twenty-one million, eight hundred twenty-five thousand, one hundred fifty-two".