21823325 has 12 divisors (see below), whose sum is σ = 28653300. Its totient is φ = 16431360.

The previous prime is 21823313. The next prime is 21823339. The reversal of 21823325 is 52332812.

It can be written as a sum of positive squares in 6 ways, for example, as 1229881 + 20593444 = 1109^2 + 4538^2 .

It is not a de Polignac number, because 21823325 - 2⁶ = 21823261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21823294 and 21823303.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25250 + ... + 26099.

It is an arithmetic number, because the mean of its divisors is an integer number (2387775).

Almost surely, 2^21823325 is an apocalyptic number.

21823325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21823325 is a deficient number, since it is larger than the sum of its proper divisors (6829975).

21823325 is a wasteful number, since it uses less digits than its factorization.

21823325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51376 (or 51371 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 21823325 is about 4671.5441772502. The cubic root of 21823325 is about 279.4518399745.

The spelling of 21823325 in words is "twenty-one million, eight hundred twenty-three thousand, three hundred twenty-five".