21852205 has 8 divisors (see below), whose sum is σ = 26295192. Its totient is φ = 17433408.

The previous prime is 21852203. The next prime is 21852239. The reversal of 21852205 is 50225812.

It can be written as a sum of positive squares in 4 ways, for example, as 5929 + 21846276 = 77^2 + 4674^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21852205 - 2¹ = 21852203 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21852205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852203) 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, 3994 + ... + 7723.

It is an arithmetic number, because the mean of its divisors is an integer number (3286899).

Almost surely, 2^21852205 is an apocalyptic number.

It is an amenable number.

21852205 is a deficient number, since it is larger than the sum of its proper divisors (4442987).

21852205 is a wasteful number, since it uses less digits than its factorization.

21852205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12095.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 21852205 is about 4674.6342102885. The cubic root of 21852205 is about 279.5750569404.

The spelling of 21852205 in words is "twenty-one million, eight hundred fifty-two thousand, two hundred five".