1223121233 has 4 divisors (see below), whose sum is σ = 1223363748. Its totient is φ = 1222878720.

The previous prime is 1223121203. The next prime is 1223121259. The reversal of 1223121233 is 3321213221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3321213221 = 71 ⋅46777651.

It can be written as a sum of positive squares in 2 ways, for example, as 241740304 + 981380929 = 15548^2 + 31327^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223121233 - 2⁶ = 1223121169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1223121203) 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, 113528 + ... + 123833.

It is an arithmetic number, because the mean of its divisors is an integer number (305840937).

Almost surely, 2^1223121233 is an apocalyptic number.

It is an amenable number.

1223121233 is a deficient number, since it is larger than the sum of its proper divisors (242515).

1223121233 is an equidigital number, since it uses as much as digits as its factorization.

1223121233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242514.

The product of its digits is 432, while the sum is 20.

The square root of 1223121233 is about 34973.1501726682. The cubic root of 1223121233 is about 1069.4401919263.

Adding to 1223121233 its reverse (3321213221), we get a palindrome (4544334454).

The spelling of 1223121233 in words is "one billion, two hundred twenty-three million, one hundred twenty-one thousand, two hundred thirty-three".