13994039021 has 2 divisors, whose sum is σ = 13994039022. Its totient is φ = 13994039020.

The previous prime is 13994039009. The next prime is 13994039041. The reversal of 13994039021 is 12093049931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13856821225 + 137217796 = 117715^2 + 11714^2 .

It is a cyclic number.

It is not a de Polignac number, because 13994039021 - 2³⁰ = 12920297197 is a prime.

It is a super-3 number, since 3×13994039021³ (a number of 31 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13994039021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13994039041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6997019510 + 6997019511.

It is an arithmetic number, because the mean of its divisors is an integer number (6997019511).

Almost surely, 2^13994039021 is an apocalyptic number.

It is an amenable number.

13994039021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13994039021 is an equidigital number, since it uses as much as digits as its factorization.

13994039021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The spelling of 13994039021 in words is "thirteen billion, nine hundred ninety-four million, thirty-nine thousand, twenty-one".