21303341 has 2 divisors, whose sum is σ = 21303342. Its totient is φ = 21303340.

The previous prime is 21303319. The next prime is 21303349. The reversal of 21303341 is 14330312.

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., 14280841 + 7022500 = 3779^2 + 2650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21303341 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21303349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651670 + 10651671.

It is an arithmetic number, because the mean of its divisors is an integer number (10651671).

Almost surely, 2^21303341 is an apocalyptic number.

It is an amenable number.

21303341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303341 is an equidigital number, since it uses as much as digits as its factorization.

21303341 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 21303341 is about 4615.5542462417. The cubic root of 21303341 is about 277.2144767684.

Adding to 21303341 its reverse (14330312), we get a palindrome (35633653).

The spelling of 21303341 in words is "twenty-one million, three hundred three thousand, three hundred forty-one".