1233321213 has 4 divisors (see below), whose sum is σ = 1644428288. Its totient is φ = 822214140.

The previous prime is 1233321197. The next prime is 1233321223. The reversal of 1233321213 is 3121233321.

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: 3121233321 = 3 ⋅1040411107.

It is not a de Polignac number, because 1233321213 - 2⁴ = 1233321197 is a prime.

It is a Duffinian number.

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 1233321213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1233321223) 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, 205553533 + ... + 205553538.

It is an arithmetic number, because the mean of its divisors is an integer number (411107072).

Almost surely, 2^1233321213 is an apocalyptic number.

It is an amenable number.

1233321213 is a deficient number, since it is larger than the sum of its proper divisors (411107075).

1233321213 is an equidigital number, since it uses as much as digits as its factorization.

1233321213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411107074.

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

The square root of 1233321213 is about 35118.6732807491. The cubic root of 1233321213 is about 1072.4047620019.

Adding to 1233321213 its reverse (3121233321), we get a palindrome (4354554534).

The spelling of 1233321213 in words is "one billion, two hundred thirty-three million, three hundred twenty-one thousand, two hundred thirteen".