21014017 has 4 divisors (see below), whose sum is σ = 21526596. Its totient is φ = 20501440.

The previous prime is 21013997. The next prime is 21014041. The reversal of 21014017 is 71041012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 952576 + 20061441 = 976^2 + 4479^2 .

It is a cyclic number.

It is not a de Polignac number, because 21014017 - 2¹⁵ = 20981249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21014047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256228 + ... + 256309.

It is an arithmetic number, because the mean of its divisors is an integer number (5381649).

Almost surely, 2^21014017 is an apocalyptic number.

It is an amenable number.

21014017 is a deficient number, since it is larger than the sum of its proper divisors (512579).

21014017 is an equidigital number, since it uses as much as digits as its factorization.

21014017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512578.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 21014017 is about 4584.1048199185. The cubic root of 21014017 is about 275.9537878591.

Adding to 21014017 its reverse (71041012), we get a palindrome (92055029).

The spelling of 21014017 in words is "twenty-one million, fourteen thousand, seventeen".