1213441321 has 2 divisors, whose sum is σ = 1213441322. Its totient is φ = 1213441320.

The previous prime is 1213441261. The next prime is 1213441331. The reversal of 1213441321 is 1231443121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 769285696 + 444155625 = 27736^2 + 21075^2 .

It is an emirp because it is prime and its reverse (1231443121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213441321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213441292 and 1213441301.

It is not a weakly prime, because it can be changed into another prime (1213441331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606720660 + 606720661.

It is an arithmetic number, because the mean of its divisors is an integer number (606720661).

Almost surely, 2^1213441321 is an apocalyptic number.

It is an amenable number.

1213441321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213441321 is an equidigital number, since it uses as much as digits as its factorization.

1213441321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 22.

The square root of 1213441321 is about 34834.4846524245. The cubic root of 1213441321 is about 1066.6114952692.

Adding to 1213441321 its reverse (1231443121), we get a palindrome (2444884442).

The spelling of 1213441321 in words is "one billion, two hundred thirteen million, four hundred forty-one thousand, three hundred twenty-one".