1123233121 has 4 divisors (see below), whose sum is σ = 1129725972. Its totient is φ = 1116740272.

The previous prime is 1123233113. The next prime is 1123233157. The reversal of 1123233121 is 1213323211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1213323211 = 103 ⋅11779837.

It can be written as a sum of positive squares in 2 ways, for example, as 973440000 + 149793121 = 31200^2 + 12239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123233121 - 2³ = 1123233113 is a prime.

It is a super-2 number, since 2×1123233121² = 2523305288222801282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123233821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3246166 + ... + 3246511.

It is an arithmetic number, because the mean of its divisors is an integer number (282431493).

Almost surely, 2^1123233121 is an apocalyptic number.

It is an amenable number.

1123233121 is a deficient number, since it is larger than the sum of its proper divisors (6492851).

1123233121 is an equidigital number, since it uses as much as digits as its factorization.

1123233121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6492850.

The product of its digits is 216, while the sum is 19.

The square root of 1123233121 is about 33514.6702355849. The cubic root of 1123233121 is about 1039.4971437963.

Adding to 1123233121 its reverse (1213323211), we get a palindrome (2336556332).

The spelling of 1123233121 in words is "one billion, one hundred twenty-three million, two hundred thirty-three thousand, one hundred twenty-one".