21824325 has 18 divisors (see below), whose sum is σ = 39090194. Its totient is φ = 11639520.

The previous prime is 21824317. The next prime is 21824329. The reversal of 21824325 is 52342812.

It can be written as a sum of positive squares in 3 ways, for example, as 6084 + 21818241 = 78^2 + 4671^2 .

It is not a de Polignac number, because 21824325 - 2³ = 21824317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21824329) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 48274 + ... + 48723.

Almost surely, 2^21824325 is an apocalyptic number.

21824325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21824325 is a deficient number, since it is larger than the sum of its proper divisors (17265869).

21824325 is a wasteful number, since it uses less digits than its factorization.

21824325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97013 (or 97005 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21824325 is about 4671.6512070145. The cubic root of 21824325 is about 279.4561083062.

The spelling of 21824325 in words is "twenty-one million, eight hundred twenty-four thousand, three hundred twenty-five".