21852265 has 4 divisors (see below), whose sum is σ = 26222724. Its totient is φ = 17481808.

The previous prime is 21852247. The next prime is 21852287. The reversal of 21852265 is 56225812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16418704 + 5433561 = 4052^2 + 2331^2 .

It is a cyclic number.

It is not a de Polignac number, because 21852265 - 2⁷ = 21852137 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2185222 + ... + 2185231.

It is an arithmetic number, because the mean of its divisors is an integer number (6555681).

Almost surely, 2^21852265 is an apocalyptic number.

It is an amenable number.

21852265 is a deficient number, since it is larger than the sum of its proper divisors (4370459).

21852265 is an equidigital number, since it uses as much as digits as its factorization.

21852265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370458.

The product of its digits is 9600, while the sum is 31.

The square root of 21852265 is about 4674.6406278986. The cubic root of 21852265 is about 279.5753128183.

The spelling of 21852265 in words is "twenty-one million, eight hundred fifty-two thousand, two hundred sixty-five".