21014263 has 4 divisors (see below), whose sum is σ = 21526848. Its totient is φ = 20501680.

The previous prime is 21014243. The next prime is 21014297. The reversal of 21014263 is 36241012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21014263 - 2¹³ = 21006071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21014263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014233) 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 in 3 ways as a sum of consecutive naturals, for example, 256231 + ... + 256312.

It is an arithmetic number, because the mean of its divisors is an integer number (5381712).

Almost surely, 2^21014263 is an apocalyptic number.

21014263 is a deficient number, since it is larger than the sum of its proper divisors (512585).

21014263 is an equidigital number, since it uses as much as digits as its factorization.

21014263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512584.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21014263 is about 4584.1316516872. The cubic root of 21014263 is about 275.9548646699.

Adding to 21014263 its reverse (36241012), we get a palindrome (57255275).

The spelling of 21014263 in words is "twenty-one million, fourteen thousand, two hundred sixty-three".