13840343921 has 2 divisors, whose sum is σ = 13840343922. Its totient is φ = 13840343920.

The previous prime is 13840343911. The next prime is 13840343939. The reversal of 13840343921 is 12934304831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13806250000 + 34093921 = 117500^2 + 5839^2 .

It is a cyclic number.

It is not a de Polignac number, because 13840343921 - 2¹⁴ = 13840327537 is a prime.

It is not a weakly prime, because it can be changed into another prime (13840343911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6920171960 + 6920171961.

It is an arithmetic number, because the mean of its divisors is an integer number (6920171961).

Almost surely, 2^13840343921 is an apocalyptic number.

It is an amenable number.

13840343921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13840343921 is an equidigital number, since it uses as much as digits as its factorization.

13840343921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 13840343921 in words is "thirteen billion, eight hundred forty million, three hundred forty-three thousand, nine hundred twenty-one".