1213312321321 has 2 divisors, whose sum is σ = 1213312321322. Its totient is φ = 1213312321320.

The previous prime is 1213312321301. The next prime is 1213312321343. The reversal of 1213312321321 is 1231232133121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1158819955225 + 54492366096 = 1076485^2 + 233436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213312321321 - 2⁹ = 1213312320809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213312321301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606656160660 + 606656160661.

It is an arithmetic number, because the mean of its divisors is an integer number (606656160661).

Almost surely, 2^{1213312321321} is an apocalyptic number.

It is an amenable number.

1213312321321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213312321321 is an equidigital number, since it uses as much as digits as its factorization.

1213312321321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

Adding to 1213312321321 its reverse (1231232133121), we get a palindrome (2444544454442).

The spelling of 1213312321321 in words is "one trillion, two hundred thirteen billion, three hundred twelve million, three hundred twenty-one thousand, three hundred twenty-one".