321023442331981 has 2 divisors, whose sum is σ = 321023442331982. Its totient is φ = 321023442331980.

The previous prime is 321023442331927. The next prime is 321023442332053. The reversal of 321023442331981 is 189133244320123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304681563316900 + 16341879015081 = 17455130^2 + 4042509^2 .

It is a cyclic number.

It is not a de Polignac number, because 321023442331981 - 2⁷ = 321023442331853 is a prime.

It is a super-2 number, since 2×321023442331981² (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 (321023442332981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160511721165990 + 160511721165991.

It is an arithmetic number, because the mean of its divisors is an integer number (160511721165991).

Almost surely, 2^{321023442331981} is an apocalyptic number.

It is an amenable number.

321023442331981 is a deficient number, since it is larger than the sum of its proper divisors (1).

321023442331981 is an equidigital number, since it uses as much as digits as its factorization.

321023442331981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 321023442331981 in words is "three hundred twenty-one trillion, twenty-three billion, four hundred forty-two million, three hundred thirty-one thousand, nine hundred eighty-one".