21341 has 2 divisors, whose sum is σ = 21342. Its totient is φ = 21340.

The previous prime is 21323. The next prime is 21347. The reversal of 21341 is 14312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21316 + 25 = 146^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 21341 - 2⁶ = 21277 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670 + 10671.

It is an arithmetic number, because the mean of its divisors is an integer number (10671).

2²¹³⁴¹ is an apocalyptic number.

It is an amenable number.

21341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21341 is an equidigital number, since it uses as much as digits as its factorization.

21341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24, while the sum is 11.

The square root of 21341 is about 146.0855913497. The cubic root of 21341 is about 27.7377729322.

Adding to 21341 its reverse (14312), we get a palindrome (35653).

The spelling of 21341 in words is "twenty-one thousand, three hundred forty-one", and thus it is an iban number.