11133231221 has 16 divisors (see below), whose sum is σ = 13142458368. Its totient is φ = 9229086000.

The previous prime is 11133231209. The next prime is 11133231223. The reversal of 11133231221 is 12213233111.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11133231221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11133231193 and 11133231202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11133231223) 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, 345446 + ... + 376296.

It is an arithmetic number, because the mean of its divisors is an integer number (821403648).

Almost surely, 2^11133231221 is an apocalyptic number.

It is an amenable number.

11133231221 is a deficient number, since it is larger than the sum of its proper divisors (2009227147).

11133231221 is a wasteful number, since it uses less digits than its factorization.

11133231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32552.

The product of its digits is 216, while the sum is 20.

Adding to 11133231221 its reverse (12213233111), we get a palindrome (23346464332).

The spelling of 11133231221 in words is "eleven billion, one hundred thirty-three million, two hundred thirty-one thousand, two hundred twenty-one".