221127 has 4 divisors (see below), whose sum is σ = 294840. Its totient is φ = 147416.

The previous prime is 221101. The next prime is 221159. The reversal of 221127 is 721122.

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 221127 - 2¹⁵ = 188359 is a prime.

It is a D-number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221197) 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, 36852 + ... + 36857.

It is an arithmetic number, because the mean of its divisors is an integer number (73710).

2²²¹¹²⁷ is an apocalyptic number.

221127 is a deficient number, since it is larger than the sum of its proper divisors (73713).

221127 is an equidigital number, since it uses as much as digits as its factorization.

221127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73712.

The product of its digits is 56, while the sum is 15.

The square root of 221127 is about 470.2414273541. The cubic root of 221127 is about 60.4710149617.

Adding to 221127 its reverse (721122), we get a palindrome (942249).

The spelling of 221127 in words is "two hundred twenty-one thousand, one hundred twenty-seven", and thus it is an iban number.