1213320323 has 4 divisors (see below), whose sum is σ = 1213585848. Its totient is φ = 1213054800.

The previous prime is 1213320319. The next prime is 1213320331. The reversal of 1213320323 is 3230233121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213320323 - 2² = 1213320319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213320295 and 1213320304.

It is not an unprimeable number, because it can be changed into a prime (1213328323) 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, 125786 + ... + 135087.

It is an arithmetic number, because the mean of its divisors is an integer number (303396462).

Almost surely, 2^1213320323 is an apocalyptic number.

1213320323 is a deficient number, since it is larger than the sum of its proper divisors (265525).

1213320323 is an equidigital number, since it uses as much as digits as its factorization.

1213320323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265524.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 1213320323 is about 34832.7478531338. The cubic root of 1213320323 is about 1066.5760417907.

Adding to 1213320323 its reverse (3230233121), we get a palindrome (4443553444).

The spelling of 1213320323 in words is "one billion, two hundred thirteen million, three hundred twenty thousand, three hundred twenty-three".