321131000001281 has 2 divisors, whose sum is σ = 321131000001282. Its totient is φ = 321131000001280.

The previous prime is 321131000001241. The next prime is 321131000001373. The reversal of 321131000001281 is 182100000131123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 303364429369600 + 17766570631681 = 17417360^2 + 4215041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321131000001281 is a prime.

It is a super-2 number, since 2×321131000001281² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (321131000001241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160565500000640 + 160565500000641.

It is an arithmetic number, because the mean of its divisors is an integer number (160565500000641).

Almost surely, 2^{321131000001281} is an apocalyptic number.

It is an amenable number.

321131000001281 is a deficient number, since it is larger than the sum of its proper divisors (1).

321131000001281 is an equidigital number, since it uses as much as digits as its factorization.

321131000001281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 321131000001281 in words is "three hundred twenty-one trillion, one hundred thirty-one billion, one thousand, two hundred eighty-one".