12000221111981 has 2 divisors, whose sum is σ = 12000221111982. Its totient is φ = 12000221111980.

The previous prime is 12000221111917. The next prime is 12000221112007. The reversal of 12000221111981 is 18911112200021.

12000221111981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7377248099881 + 4622973012100 = 2716109^2 + 2150110^2 .

It is a cyclic number.

It is not a de Polignac number, because 12000221111981 - 2⁶ = 12000221111917 is a prime.

It is a super-2 number, since 2×12000221111981² (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 (12000221111911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000110555990 + 6000110555991.

It is an arithmetic number, because the mean of its divisors is an integer number (6000110555991).

Almost surely, 2^{12000221111981} is an apocalyptic number.

It is an amenable number.

12000221111981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12000221111981 is an equidigital number, since it uses as much as digits as its factorization.

12000221111981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 29.

The spelling of 12000221111981 in words is "twelve trillion, two hundred twenty-one million, one hundred eleven thousand, nine hundred eighty-one".