21050059 has 2 divisors, whose sum is σ = 21050060. Its totient is φ = 21050058.

The previous prime is 21050053. The next prime is 21050101. The reversal of 21050059 is 95005012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21050059 is a prime.

It is equal to p_1332940 and since 21050059 and 1332940 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21050053) 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, 10525029 + 10525030.

It is an arithmetic number, because the mean of its divisors is an integer number (10525030).

Almost surely, 2^21050059 is an apocalyptic number.

21050059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21050059 is an equidigital number, since it uses as much as digits as its factorization.

21050059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 21050059 is about 4588.0343285551. The cubic root of 21050059 is about 276.1114642902. Note that the first 3 decimals are identical.

The spelling of 21050059 in words is "twenty-one million, fifty thousand, fifty-nine".