1121131221 has 12 divisors (see below), whose sum is σ = 1738897632. Its totient is φ = 640646328.

The previous prime is 1121131201. The next prime is 1121131223. The reversal of 1121131221 is 1221311211.

It is not a de Polignac number, because 1121131221 - 2⁵ = 1121131189 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121131221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121131223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3813225 + ... + 3813518.

It is an arithmetic number, because the mean of its divisors is an integer number (144908136).

Almost surely, 2^1121131221 is an apocalyptic number.

It is an amenable number.

1121131221 is a deficient number, since it is larger than the sum of its proper divisors (617766411).

1121131221 is an equidigital number, since it uses as much as digits as its factorization.

1121131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7626760 (or 7626753 counting only the distinct ones).

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

The square root of 1121131221 is about 33483.2976422574. The cubic root of 1121131221 is about 1038.8483371506.

Adding to 1121131221 its reverse (1221311211), we get a palindrome (2342442432).

The spelling of 1121131221 in words is "one billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty-one".