21327305 has 8 divisors (see below), whose sum is σ = 25657800. Its totient is φ = 17018496.

The previous prime is 21327301. The next prime is 21327307. The reversal of 21327305 is 50372312.

It can be written as a sum of positive squares in 4 ways, for example, as 13278736 + 8048569 = 3644^2 + 2837^2 .

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 21327305 - 2² = 21327301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21327301) 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, 3170 + ... + 7259.

It is an arithmetic number, because the mean of its divisors is an integer number (3207225).

Almost surely, 2^21327305 is an apocalyptic number.

It is an amenable number.

21327305 is a deficient number, since it is larger than the sum of its proper divisors (4330495).

21327305 is a wasteful number, since it uses less digits than its factorization.

21327305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10843.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 21327305 is about 4618.1495211827. The cubic root of 21327305 is about 277.3183834487.

Adding to 21327305 its reverse (50372312), we get a palindrome (71699617).

The spelling of 21327305 in words is "twenty-one million, three hundred twenty-seven thousand, three hundred five".