11204231221 has 4 divisors (see below), whose sum is σ = 11242471212. Its totient is φ = 11165991232.

The previous prime is 11204231179. The next prime is 11204231281. The reversal of 11204231221 is 12213240211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12213240211 = 78977 ⋅154643.

It can be written as a sum of positive squares in 2 ways, for example, as 10893096900 + 311134321 = 104370^2 + 17639^2 .

It is a cyclic number.

It is not a de Polignac number, because 11204231221 - 2¹⁹ = 11203706933 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 (11204231281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19119556 + ... + 19120141.

It is an arithmetic number, because the mean of its divisors is an integer number (2810617803).

Almost surely, 2^11204231221 is an apocalyptic number.

It is an amenable number.

11204231221 is a deficient number, since it is larger than the sum of its proper divisors (38239991).

11204231221 is an equidigital number, since it uses as much as digits as its factorization.

11204231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38239990.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 11204231221 its reverse (12213240211), we get a palindrome (23417471432).

The spelling of 11204231221 in words is "eleven billion, two hundred four million, two hundred thirty-one thousand, two hundred twenty-one".