11321311439981 has 2 divisors, whose sum is σ = 11321311439982. Its totient is φ = 11321311439980.

The previous prime is 11321311439899. The next prime is 11321311440029. The reversal of 11321311439981 is 18993411312311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11296892377225 + 24419062756 = 3361085^2 + 156266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11321311439981 is a prime.

It is a super-2 number, since 2×11321311439981² (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 (11321311430981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5660655719990 + 5660655719991.

It is an arithmetic number, because the mean of its divisors is an integer number (5660655719991).

Almost surely, 2^{11321311439981} is an apocalyptic number.

It is an amenable number.

11321311439981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11321311439981 is an equidigital number, since it uses as much as digits as its factorization.

11321311439981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 47.

The spelling of 11321311439981 in words is "eleven trillion, three hundred twenty-one billion, three hundred eleven million, four hundred thirty-nine thousand, nine hundred eighty-one".