13321320035921 has 2 divisors, whose sum is σ = 13321320035922. Its totient is φ = 13321320035920.

The previous prime is 13321320035851. The next prime is 13321320035981. The reversal of 13321320035921 is 12953002312331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9508829482321 + 3812490553600 = 3083639^2 + 1952560^2 .

It is an emirp because it is prime and its reverse (12953002312331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13321320035921 - 2¹⁴ = 13321320019537 is a prime.

It is not a weakly prime, because it can be changed into another prime (13321320035981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6660660017960 + 6660660017961.

It is an arithmetic number, because the mean of its divisors is an integer number (6660660017961).

Almost surely, 2^{13321320035921} is an apocalyptic number.

It is an amenable number.

13321320035921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13321320035921 is an equidigital number, since it uses as much as digits as its factorization.

13321320035921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 35.

The spelling of 13321320035921 in words is "thirteen trillion, three hundred twenty-one billion, three hundred twenty million, thirty-five thousand, nine hundred twenty-one".