2101111000981 has 2 divisors, whose sum is σ = 2101111000982. Its totient is φ = 2101111000980.

The previous prime is 2101111000957. The next prime is 2101111001023. The reversal of 2101111000981 is 1890001111012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2088747562500 + 12363438481 = 1445250^2 + 111191^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101111000981 - 2³¹ = 2098963517333 is a prime.

It is a super-2 number, since 2×2101111000981² (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 (2101121000981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050555500490 + 1050555500491.

It is an arithmetic number, because the mean of its divisors is an integer number (1050555500491).

Almost surely, 2^{2101111000981} is an apocalyptic number.

It is an amenable number.

2101111000981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101111000981 is an equidigital number, since it uses as much as digits as its factorization.

2101111000981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 25.

Adding to 2101111000981 its reverse (1890001111012), we get a palindrome (3991112111993).

The spelling of 2101111000981 in words is "two trillion, one hundred one billion, one hundred eleven million, nine hundred eighty-one", and thus it is an aban number.