21341065 has 4 divisors (see below), whose sum is σ = 25609284. Its totient is φ = 17072848.

The previous prime is 21341063. The next prime is 21341077. The reversal of 21341065 is 56014312.

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 11431161 + 9909904 = 3381^2 + 3148^2 .

It is a cyclic number.

It is not a de Polignac number, because 21341065 - 2¹ = 21341063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21341063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2134102 + ... + 2134111.

It is an arithmetic number, because the mean of its divisors is an integer number (6402321).

Almost surely, 2^21341065 is an apocalyptic number.

It is an amenable number.

21341065 is a deficient number, since it is larger than the sum of its proper divisors (4268219).

21341065 is an equidigital number, since it uses as much as digits as its factorization.

21341065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4268218.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21341065 is about 4619.6390551644. The cubic root of 21341065 is about 277.3780109325.

Adding to 21341065 its reverse (56014312), we get a palindrome (77355377).

The spelling of 21341065 in words is "twenty-one million, three hundred forty-one thousand, sixty-five".