21341305 has 4 divisors (see below), whose sum is σ = 25609572. Its totient is φ = 17073040.

The previous prime is 21341249. The next prime is 21341317. The reversal of 21341305 is 50314312.

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 5683456 + 15657849 = 2384^2 + 3957^2 .

It is not a de Polignac number, because 21341305 - 2²³ = 12952697 is a prime.

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, 2134126 + ... + 2134135.

It is an arithmetic number, because the mean of its divisors is an integer number (6402393).

Almost surely, 2^21341305 is an apocalyptic number.

It is an amenable number.

21341305 is a deficient number, since it is larger than the sum of its proper divisors (4268267).

21341305 is an equidigital number, since it uses as much as digits as its factorization.

21341305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4268266.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21341305 is about 4619.6650311467. The cubic root of 21341305 is about 277.3790507193.

Adding to 21341305 its reverse (50314312), we get a palindrome (71655617).

The spelling of 21341305 in words is "twenty-one million, three hundred forty-one thousand, three hundred five".