12111020219981 has 2 divisors, whose sum is σ = 12111020219982. Its totient is φ = 12111020219980.

The previous prime is 12111020219959. The next prime is 12111020220031. The reversal of 12111020219981 is 18991202011121.

12111020219981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10965336846025 + 1145683373956 = 3311395^2 + 1070366^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111020219981 - 2¹⁸ = 12111019957837 is a prime.

It is a super-2 number, since 2×12111020219981² (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 (12111020219281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055510109990 + 6055510109991.

It is an arithmetic number, because the mean of its divisors is an integer number (6055510109991).

Almost surely, 2^{12111020219981} is an apocalyptic number.

It is an amenable number.

12111020219981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111020219981 is an equidigital number, since it uses as much as digits as its factorization.

12111020219981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 38.

The spelling of 12111020219981 in words is "twelve trillion, one hundred eleven billion, twenty million, two hundred nineteen thousand, nine hundred eighty-one".