1131112221 has 16 divisors (see below), whose sum is σ = 1648378368. Its totient is φ = 686822400.

The previous prime is 1131112189. The next prime is 1131112261. The reversal of 1131112221 is 1222111311.

It is not a de Polignac number, because 1131112221 - 2⁵ = 1131112189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1131112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131112261) 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 15 ways as a sum of consecutive naturals, for example, 356140 + ... + 359301.

It is an arithmetic number, because the mean of its divisors is an integer number (103023648).

Almost surely, 2^1131112221 is an apocalyptic number.

It is an amenable number.

1131112221 is a deficient number, since it is larger than the sum of its proper divisors (517266147).

1131112221 is a wasteful number, since it uses less digits than its factorization.

1131112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715492.

The product of its digits is 24, while the sum is 15.

The square root of 1131112221 is about 33632.0118488324. The cubic root of 1131112221 is about 1041.9220561157.

Adding to 1131112221 its reverse (1222111311), we get a palindrome (2353223532).

It can be divided in two parts, 11311 and 12221, that added together give a palindrome (23532).

The spelling of 1131112221 in words is "one billion, one hundred thirty-one million, one hundred twelve thousand, two hundred twenty-one".