21327127 has 4 divisors (see below), whose sum is σ = 21406680. Its totient is φ = 21247576.

The previous prime is 21327109. The next prime is 21327149. The reversal of 21327127 is 72172312.

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 21327127 - 2¹⁵ = 21294359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21327107) 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, 39373 + ... + 39910.

It is an arithmetic number, because the mean of its divisors is an integer number (5351670).

Almost surely, 2^21327127 is an apocalyptic number.

21327127 is a deficient number, since it is larger than the sum of its proper divisors (79553).

21327127 is an equidigital number, since it uses as much as digits as its factorization.

21327127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79552.

The product of its digits is 1176, while the sum is 25.

The square root of 21327127 is about 4618.1302493542. The cubic root of 21327127 is about 277.3176119368.

Adding to 21327127 its reverse (72172312), we get a palindrome (93499439).

The spelling of 21327127 in words is "twenty-one million, three hundred twenty-seven thousand, one hundred twenty-seven".