21017327 has 2 divisors, whose sum is σ = 21017328. Its totient is φ = 21017326.

The previous prime is 21017317. The next prime is 21017329. The reversal of 21017327 is 72371012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21017327 - 2⁸ = 21017071 is a prime.

Together with 21017329, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21017329) 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, 10508663 + 10508664.

It is an arithmetic number, because the mean of its divisors is an integer number (10508664).

Almost surely, 2^21017327 is an apocalyptic number.

21017327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21017327 is an equidigital number, since it uses as much as digits as its factorization.

21017327 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 21017327 is about 4584.4658358417. The cubic root of 21017327 is about 275.9682759518.

Adding to 21017327 its reverse (72371012), we get a palindrome (93388339).

The spelling of 21017327 in words is "twenty-one million, seventeen thousand, three hundred twenty-seven".