11113231221 has 6 divisors (see below), whose sum is σ = 16052445110. Its totient is φ = 7408820808.

The previous prime is 11113231189. The next prime is 11113231229. The reversal of 11113231221 is 12213231111.

It can be written as a sum of positive squares in only one way, i.e., 5955980625 + 5157250596 = 77175^2 + 71814^2 .

It is not a de Polignac number, because 11113231221 - 2⁵ = 11113231189 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 = 11113231194 and 11113231203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11113231229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 617401726 + ... + 617401743.

Almost surely, 2^11113231221 is an apocalyptic number.

It is an amenable number.

11113231221 is a deficient number, since it is larger than the sum of its proper divisors (4939213889).

11113231221 is a wasteful number, since it uses less digits than its factorization.

11113231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234803475 (or 1234803472 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 11113231221 its reverse (12213231111), we get a palindrome (23326462332).

The spelling of 11113231221 in words is "eleven billion, one hundred thirteen million, two hundred thirty-one thousand, two hundred twenty-one".