1213344321 has 16 divisors (see below), whose sum is σ = 1886640000. Its totient is φ = 693339024.

The previous prime is 1213344289. The next prime is 1213344337. The reversal of 1213344321 is 1234433121.

It is a happy number.

It is not a de Polignac number, because 1213344321 - 2⁵ = 1213344289 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1213344291 and 1213344300.

It is not an unprimeable number, because it can be changed into a prime (1213344421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 588546 + ... + 590603.

It is an arithmetic number, because the mean of its divisors is an integer number (117915000).

Almost surely, 2^1213344321 is an apocalyptic number.

It is an amenable number.

1213344321 is a deficient number, since it is larger than the sum of its proper divisors (673295679).

1213344321 is an equidigital number, since it uses as much as digits as its factorization.

1213344321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179173 (or 1179159 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

The square root of 1213344321 is about 34833.0923261200. The cubic root of 1213344321 is about 1066.5830736032.

Adding to 1213344321 its reverse (1234433121), we get a palindrome (2447777442).

The spelling of 1213344321 in words is "one billion, two hundred thirteen million, three hundred forty-four thousand, three hundred twenty-one".