13320019981 has 2 divisors, whose sum is σ = 13320019982. Its totient is φ = 13320019980.

The previous prime is 13320019961. The next prime is 13320019987. The reversal of 13320019981 is 18991002331.

13320019981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12603654756 + 716365225 = 112266^2 + 26765^2 .

It is a cyclic number.

It is not a de Polignac number, because 13320019981 - 2¹¹ = 13320017933 is a prime.

It is a super-2 number, since 2×13320019981² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13320019981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13320019987) 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, 6660009990 + 6660009991.

It is an arithmetic number, because the mean of its divisors is an integer number (6660009991).

Almost surely, 2^13320019981 is an apocalyptic number.

It is an amenable number.

13320019981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13320019981 is an equidigital number, since it uses as much as digits as its factorization.

13320019981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

It can be divided in two parts, 133200 and 19981, that added together give a triangular number (153181 = T₅₅₃).

The spelling of 13320019981 in words is "thirteen billion, three hundred twenty million, nineteen thousand, nine hundred eighty-one".