21352559 has 2 divisors, whose sum is σ = 21352560. Its totient is φ = 21352558.

The previous prime is 21352549. The next prime is 21352571. The reversal of 21352559 is 95525312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21352559 - 2⁴ = 21352543 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21352549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676279 + 10676280.

It is an arithmetic number, because the mean of its divisors is an integer number (10676280).

Almost surely, 2^21352559 is an apocalyptic number.

21352559 is a deficient number, since it is larger than the sum of its proper divisors (1).

21352559 is an equidigital number, since it uses as much as digits as its factorization.

21352559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13500, while the sum is 32.

The square root of 21352559 is about 4620.8829242906. The cubic root of 21352559 is about 277.4277993046.

The spelling of 21352559 in words is "twenty-one million, three hundred fifty-two thousand, five hundred fifty-nine".