27121 has 4 divisors (see below), whose sum is σ = 27892. Its totient is φ = 26352.

The previous prime is 27109. The next prime is 27127. The reversal of 27121 is 12172.

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 25600 + 1521 = 160^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 27121 - 2⁷ = 26993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330 + ... + 403.

It is an arithmetic number, because the mean of its divisors is an integer number (6973).

2²⁷¹²¹ is an apocalyptic number.

It is an amenable number.

27121 is a deficient number, since it is larger than the sum of its proper divisors (771).

27121 is an equidigital number, since it uses as much as digits as its factorization.

27121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770.

The product of its digits is 28, while the sum is 13.

The square root of 27121 is about 164.6845469375. The cubic root of 27121 is about 30.0447480354.

Adding to 27121 its reverse (12172), we get a palindrome (39293).

It can be divided in two parts, 271 and 21, that added together give a palindrome (292).

The spelling of 27121 in words is "twenty-seven thousand, one hundred twenty-one", and thus it is an iban number.