21020059 has 2 divisors, whose sum is σ = 21020060. Its totient is φ = 21020058.

The previous prime is 21020057. The next prime is 21020081. The reversal of 21020059 is 95002012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020059 - 2¹ = 21020057 is a prime.

Together with 21020057, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21020053) 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, 10510029 + 10510030.

It is an arithmetic number, because the mean of its divisors is an integer number (10510030).

Almost surely, 2^21020059 is an apocalyptic number.

21020059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020059 is an equidigital number, since it uses as much as digits as its factorization.

21020059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 21020059 is about 4584.7637888991. The cubic root of 21020059 is about 275.9802329539.

The spelling of 21020059 in words is "twenty-one million, twenty thousand, fifty-nine".