1233123321 has 4 divisors (see below), whose sum is σ = 1644164432. Its totient is φ = 822082212.

The previous prime is 1233123289. The next prime is 1233123329. The reversal of 1233123321 is 1233213321.

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 an emirpimes, since its reverse is a distinct semiprime: 1233213321 = 3 ⋅411071107.

It is not a de Polignac number, because 1233123321 - 2⁵ = 1233123289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1233123329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205520551 + ... + 205520556.

It is an arithmetic number, because the mean of its divisors is an integer number (411041108).

Almost surely, 2^1233123321 is an apocalyptic number.

It is an amenable number.

1233123321 is a deficient number, since it is larger than the sum of its proper divisors (411041111).

1233123321 is an equidigital number, since it uses as much as digits as its factorization.

1233123321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411041110.

The product of its digits is 648, while the sum is 21.

The square root of 1233123321 is about 35115.8556922653. The cubic root of 1233123321 is about 1072.3474015261.

Adding to 1233123321 its reverse (1233213321), we get a palindrome (2466336642).

Subtracting 1233123321 from its reverse (1233213321), we obtain a square (90000 = 300²).

The spelling of 1233123321 in words is "one billion, two hundred thirty-three million, one hundred twenty-three thousand, three hundred twenty-one".