2130320131981 has 2 divisors, whose sum is σ = 2130320131982. Its totient is φ = 2130320131980.

The previous prime is 2130320131957. The next prime is 2130320132053. The reversal of 2130320131981 is 1891310230312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2126539726756 + 3780405225 = 1458266^2 + 61485^2 .

It is a cyclic number.

It is not a de Polignac number, because 2130320131981 - 2⁵ = 2130320131949 is a prime.

It is a super-2 number, since 2×2130320131981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2130320132981) 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, 1065160065990 + 1065160065991.

It is an arithmetic number, because the mean of its divisors is an integer number (1065160065991).

Almost surely, 2^{2130320131981} is an apocalyptic number.

It is an amenable number.

2130320131981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2130320131981 is an equidigital number, since it uses as much as digits as its factorization.

2130320131981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 2130320131981 in words is "two trillion, one hundred thirty billion, three hundred twenty million, one hundred thirty-one thousand, nine hundred eighty-one".