11143221 has 16 divisors (see below), whose sum is σ = 15456000. Its totient is φ = 7132608.

The previous prime is 11143219. The next prime is 11143243. The reversal of 11143221 is 12234111.

It is not a de Polignac number, because 11143221 - 2¹ = 11143219 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11143221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11143421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30180 + ... + 30546.

It is an arithmetic number, because the mean of its divisors is an integer number (966000).

Almost surely, 2^11143221 is an apocalyptic number.

It is an amenable number.

11143221 is a deficient number, since it is larger than the sum of its proper divisors (4312779).

11143221 is a wasteful number, since it uses less digits than its factorization.

11143221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748.

The product of its digits is 48, while the sum is 15.

The square root of 11143221 is about 3338.1463419089. The cubic root of 11143221 is about 223.3590641377.

Adding to 11143221 its reverse (12234111), we get a palindrome (23377332).

The spelling of 11143221 in words is "eleven million, one hundred forty-three thousand, two hundred twenty-one".