11219221 has 4 divisors (see below), whose sum is σ = 12082252. Its totient is φ = 10356192.

The previous prime is 11219209. The next prime is 11219231. The reversal of 11219221 is 12291211.

It is a happy number.

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 2604996 + 8614225 = 1614^2 + 2935^2 .

It is a cyclic number.

It is not a de Polignac number, because 11219221 - 2¹³ = 11211029 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11219231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431496 + ... + 431521.

It is an arithmetic number, because the mean of its divisors is an integer number (3020563).

Almost surely, 2^11219221 is an apocalyptic number.

It is an amenable number.

11219221 is a deficient number, since it is larger than the sum of its proper divisors (863031).

11219221 is an equidigital number, since it uses as much as digits as its factorization.

11219221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863030.

The product of its digits is 72, while the sum is 19.

The square root of 11219221 is about 3349.5105612612. The cubic root of 11219221 is about 223.8657052698.

The spelling of 11219221 in words is "eleven million, two hundred nineteen thousand, two hundred twenty-one".