111020202209981 has 2 divisors, whose sum is σ = 111020202209982. Its totient is φ = 111020202209980.

The previous prime is 111020202209957. The next prime is 111020202210031. The reversal of 111020202209981 is 189902202020111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85147974284356 + 25872227925625 = 9227566^2 + 5086475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111020202209981 is a prime.

It is a super-3 number, since 3×111020202209981³ (a number of 43 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 (111020202209381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510101104990 + 55510101104991.

It is an arithmetic number, because the mean of its divisors is an integer number (55510101104991).

Almost surely, 2^{111020202209981} is an apocalyptic number.

It is an amenable number.

111020202209981 is a deficient number, since it is larger than the sum of its proper divisors (1).

111020202209981 is an equidigital number, since it uses as much as digits as its factorization.

111020202209981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 38.

The spelling of 111020202209981 in words is "one hundred eleven trillion, twenty billion, two hundred two million, two hundred nine thousand, nine hundred eighty-one".