1010111219981 has 2 divisors, whose sum is σ = 1010111219982. Its totient is φ = 1010111219980.

The previous prime is 1010111219959. The next prime is 1010111220011. The reversal of 1010111219981 is 1899121110101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 963047822500 + 47063397481 = 981350^2 + 216941^2 .

It is a cyclic number.

It is not a de Polignac number, because 1010111219981 - 2³⁴ = 992931350797 is a prime.

It is a super-2 number, since 2×1010111219981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1010111219911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505055609990 + 505055609991.

It is an arithmetic number, because the mean of its divisors is an integer number (505055609991).

Almost surely, 2^{1010111219981} is an apocalyptic number.

It is an amenable number.

1010111219981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010111219981 is an equidigital number, since it uses as much as digits as its factorization.

1010111219981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 35.

The spelling of 1010111219981 in words is "one trillion, ten billion, one hundred eleven million, two hundred nineteen thousand, nine hundred eighty-one".