13121333321 has 2 divisors, whose sum is σ = 13121333322. Its totient is φ = 13121333320.

The previous prime is 13121333293. The next prime is 13121333339. The reversal of 13121333321 is 12333312131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11970766921 + 1150566400 = 109411^2 + 33920^2 .

It is a cyclic number.

It is not a de Polignac number, because 13121333321 - 2¹⁰ = 13121332297 is a prime.

It is not a weakly prime, because it can be changed into another prime (13121333221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6560666660 + 6560666661.

It is an arithmetic number, because the mean of its divisors is an integer number (6560666661).

Almost surely, 2^13121333321 is an apocalyptic number.

It is an amenable number.

13121333321 is a deficient number, since it is larger than the sum of its proper divisors (1).

13121333321 is an equidigital number, since it uses as much as digits as its factorization.

13121333321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 23.

Adding to 13121333321 its reverse (12333312131), we get a palindrome (25454645452).

The spelling of 13121333321 in words is "thirteen billion, one hundred twenty-one million, three hundred thirty-three thousand, three hundred twenty-one".