1121123221 has 4 divisors (see below), whose sum is σ = 1121225344. Its totient is φ = 1121021100.

The previous prime is 1121123203. The next prime is 1121123243. The reversal of 1121123221 is 1223211211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1223211211 = 103 ⋅11875837.

It is a cyclic number.

It is not a de Polignac number, because 1121123221 - 2⁵ = 1121123189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121123195 and 1121123204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121123621) 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, 32295 + ... + 57316.

It is an arithmetic number, because the mean of its divisors is an integer number (280306336).

Almost surely, 2^1121123221 is an apocalyptic number.

It is an amenable number.

1121123221 is a deficient number, since it is larger than the sum of its proper divisors (102123).

1121123221 is an equidigital number, since it uses as much as digits as its factorization.

1121123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102122.

The product of its digits is 48, while the sum is 16.

The square root of 1121123221 is about 33483.1781794978. The cubic root of 1121123221 is about 1038.8458661920.

Adding to 1121123221 its reverse (1223211211), we get a palindrome (2344334432).

The spelling of 1121123221 in words is "one billion, one hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty-one".