11271221 has 8 divisors (see below), whose sum is σ = 12852504. Its totient is φ = 9792000.

The previous prime is 11271193. The next prime is 11271223. The reversal of 11271221 is 12217211.

It can be written as a sum of positive squares in 4 ways, for example, as 2686321 + 8584900 = 1639^2 + 2930^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11271221 - 2⁶ = 11271157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11271221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11271223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25280 + ... + 25721.

It is an arithmetic number, because the mean of its divisors is an integer number (1606563).

Almost surely, 2^11271221 is an apocalyptic number.

It is an amenable number.

11271221 is a deficient number, since it is larger than the sum of its proper divisors (1581283).

11271221 is a wasteful number, since it uses less digits than its factorization.

11271221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51031.

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

The square root of 11271221 is about 3357.2639157504. The cubic root of 11271221 is about 224.2110375600.

Adding to 11271221 its reverse (12217211), we get a palindrome (23488432).

The spelling of 11271221 in words is "eleven million, two hundred seventy-one thousand, two hundred twenty-one".