111210220981 has 2 divisors, whose sum is σ = 111210220982. Its totient is φ = 111210220980.

The previous prime is 111210220909. The next prime is 111210221027. The reversal of 111210220981 is 189022012111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82432152100 + 28778068881 = 287110^2 + 169641^2 .

It is an emirp because it is prime and its reverse (189022012111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111210220981 - 2¹⁵ = 111210188213 is a prime.

It is a super-3 number, since 3×111210220981³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111210220081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605110490 + 55605110491.

It is an arithmetic number, because the mean of its divisors is an integer number (55605110491).

Almost surely, 2^111210220981 is an apocalyptic number.

It is an amenable number.

111210220981 is a deficient number, since it is larger than the sum of its proper divisors (1).

111210220981 is an equidigital number, since it uses as much as digits as its factorization.

111210220981 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 28.

The spelling of 111210220981 in words is "one hundred eleven billion, two hundred ten million, two hundred twenty thousand, nine hundred eighty-one".