21652205 has 8 divisors (see below), whose sum is σ = 26092800. Its totient is φ = 17248336.

The previous prime is 21652201. The next prime is 21652217. The reversal of 21652205 is 50225612.

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 21652205 - 2² = 21652201 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21652201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7865 + ... + 10254.

It is an arithmetic number, because the mean of its divisors is an integer number (3261600).

Almost surely, 2^21652205 is an apocalyptic number.

It is an amenable number.

21652205 is a deficient number, since it is larger than the sum of its proper divisors (4440595).

21652205 is a wasteful number, since it uses less digits than its factorization.

21652205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18363.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 21652205 is about 4653.1929897652. The cubic root of 21652205 is about 278.7195144525.

Adding to 21652205 its reverse (50225612), we get a palindrome (71877817).

The spelling of 21652205 in words is "twenty-one million, six hundred fifty-two thousand, two hundred five".