12011010109981 has 2 divisors, whose sum is σ = 12011010109982. Its totient is φ = 12011010109980.

The previous prime is 12011010109957. The next prime is 12011010110003. The reversal of 12011010109981 is 18990101011021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9343965104100 + 2667045005881 = 3056790^2 + 1633109^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12011010109981 is a prime.

It is a super-2 number, since 2×12011010109981² (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 (12011010109951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6005505054990 + 6005505054991.

It is an arithmetic number, because the mean of its divisors is an integer number (6005505054991).

Almost surely, 2^{12011010109981} is an apocalyptic number.

It is an amenable number.

12011010109981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12011010109981 is an equidigital number, since it uses as much as digits as its factorization.

12011010109981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 34.

The spelling of 12011010109981 in words is "twelve trillion, eleven billion, ten million, one hundred nine thousand, nine hundred eighty-one".