321131013329981 has 2 divisors, whose sum is σ = 321131013329982. Its totient is φ = 321131013329980.

The previous prime is 321131013329963. The next prime is 321131013330031. The reversal of 321131013329981 is 189923310131123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 229878177886756 + 91252835443225 = 15161734^2 + 9552635^2 .

It is a cyclic number.

It is not a de Polignac number, because 321131013329981 - 2²⁶ = 321130946221117 is a prime.

It is a super-2 number, since 2×321131013329981² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321131013322981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160565506664990 + 160565506664991.

It is an arithmetic number, because the mean of its divisors is an integer number (160565506664991).

Almost surely, 2^{321131013329981} is an apocalyptic number.

It is an amenable number.

321131013329981 is a deficient number, since it is larger than the sum of its proper divisors (1).

321131013329981 is an equidigital number, since it uses as much as digits as its factorization.

321131013329981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 47.

The spelling of 321131013329981 in words is "three hundred twenty-one trillion, one hundred thirty-one billion, thirteen million, three hundred twenty-nine thousand, nine hundred eighty-one".