21300959 has 2 divisors, whose sum is σ = 21300960. Its totient is φ = 21300958.

The previous prime is 21300943. The next prime is 21300973. The reversal of 21300959 is 95900312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21300959 - 2⁴ = 21300943 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 (21300989) 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, 10650479 + 10650480.

It is an arithmetic number, because the mean of its divisors is an integer number (10650480).

Almost surely, 2^21300959 is an apocalyptic number.

21300959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300959 is an equidigital number, since it uses as much as digits as its factorization.

21300959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 21300959 is about 4615.2961985121. The cubic root of 21300959 is about 277.2041442812.

The spelling of 21300959 in words is "twenty-one million, three hundred thousand, nine hundred fifty-nine".