13033121201981 has 2 divisors, whose sum is σ = 13033121201982. Its totient is φ = 13033121201980.

The previous prime is 13033121201929. The next prime is 13033121201993. The reversal of 13033121201981 is 18910212133031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12378047880025 + 655073321956 = 3518245^2 + 809366^2 .

It is a cyclic number.

It is not a de Polignac number, because 13033121201981 - 2⁶ = 13033121201917 is a prime.

It is a super-2 number, since 2×13033121201981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13033121204981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6516560600990 + 6516560600991.

It is an arithmetic number, because the mean of its divisors is an integer number (6516560600991).

Almost surely, 2^{13033121201981} is an apocalyptic number.

It is an amenable number.

13033121201981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13033121201981 is an equidigital number, since it uses as much as digits as its factorization.

13033121201981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 13033121201981 in words is "thirteen trillion, thirty-three billion, one hundred twenty-one million, two hundred one thousand, nine hundred eighty-one".