11233031221 has 4 divisors (see below), whose sum is σ = 11233620652. Its totient is φ = 11232441792.

The previous prime is 11233031171. The next prime is 11233031239. The reversal of 11233031221 is 12213033211.

11233031221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6258550321 + 4974480900 = 79111^2 + 70530^2 .

It is a cyclic number.

It is not a de Polignac number, because 11233031221 - 2³¹ = 9085547573 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 (11233034221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265140 + ... + 304573.

It is an arithmetic number, because the mean of its divisors is an integer number (2808405163).

Almost surely, 2^11233031221 is an apocalyptic number.

It is an amenable number.

11233031221 is a deficient number, since it is larger than the sum of its proper divisors (589431).

11233031221 is an equidigital number, since it uses as much as digits as its factorization.

11233031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589430.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 11233031221 its reverse (12213033211), we get a palindrome (23446064432).

The spelling of 11233031221 in words is "eleven billion, two hundred thirty-three million, thirty-one thousand, two hundred twenty-one".