11221271 has 4 divisors (see below), whose sum is σ = 11240544. Its totient is φ = 11202000.

The previous prime is 11221253. The next prime is 11221283. The reversal of 11221271 is 17212211.

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 11221271 - 2¹⁰ = 11220247 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 (11221211) 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, 8735 + ... + 9936.

It is an arithmetic number, because the mean of its divisors is an integer number (2810136).

Almost surely, 2^11221271 is an apocalyptic number.

11221271 is a deficient number, since it is larger than the sum of its proper divisors (19273).

11221271 is an equidigital number, since it uses as much as digits as its factorization.

11221271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19272.

The product of its digits is 56, while the sum is 17.

The square root of 11221271 is about 3349.8165621419. The cubic root of 11221271 is about 223.8793395125.

Adding to 11221271 its reverse (17212211), we get a palindrome (28433482).

The spelling of 11221271 in words is "eleven million, two hundred twenty-one thousand, two hundred seventy-one".