21014459 has 2 divisors, whose sum is σ = 21014460. Its totient is φ = 21014458.

The previous prime is 21014453. The next prime is 21014471. The reversal of 21014459 is 95441012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21014459 is a prime.

It is a Chen prime.

It is equal to p_1330829 and since 21014459 and 1330829 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 (21014453) 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, 10507229 + 10507230.

It is an arithmetic number, because the mean of its divisors is an integer number (10507230).

Almost surely, 2^21014459 is an apocalyptic number.

21014459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014459 is an equidigital number, since it uses as much as digits as its factorization.

21014459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 21014459 is about 4584.1530297319. The cubic root of 21014459 is about 275.9557226108.

The spelling of 21014459 in words is "twenty-one million, fourteen thousand, four hundred fifty-nine".