13993367021 has 2 divisors, whose sum is σ = 13993367022. Its totient is φ = 13993367020.

The previous prime is 13993366993. The next prime is 13993367081. The reversal of 13993367021 is 12076339931.

It is a happy number.

13993367021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7941304996 + 6052062025 = 89114^2 + 77795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13993367021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13993367081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6996683510 + 6996683511.

It is an arithmetic number, because the mean of its divisors is an integer number (6996683511).

Almost surely, 2^13993367021 is an apocalyptic number.

It is an amenable number.

13993367021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13993367021 is an equidigital number, since it uses as much as digits as its factorization.

13993367021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183708, while the sum is 44.

The spelling of 13993367021 in words is "thirteen billion, nine hundred ninety-three million, three hundred sixty-seven thousand, twenty-one".