21365359 has 2 divisors, whose sum is σ = 21365360. Its totient is φ = 21365358.

The previous prime is 21365353. The next prime is 21365363. The reversal of 21365359 is 95356312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21365359 - 2¹¹ = 21363311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21365353) 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 as a sum of consecutive naturals, namely, 10682679 + 10682680.

It is an arithmetic number, because the mean of its divisors is an integer number (10682680).

Almost surely, 2^21365359 is an apocalyptic number.

21365359 is a deficient number, since it is larger than the sum of its proper divisors (1).

21365359 is an equidigital number, since it uses as much as digits as its factorization.

21365359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 34.

The square root of 21365359 is about 4622.2677334832. The cubic root of 21365359 is about 277.4832238323.

The spelling of 21365359 in words is "twenty-one million, three hundred sixty-five thousand, three hundred fifty-nine".