2110199999981 has 2 divisors, whose sum is σ = 2110199999982. Its totient is φ = 2110199999980.

The previous prime is 2110199999977. The next prime is 2110200000037. The reversal of 2110199999981 is 1899999910112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2109947984356 + 252015625 = 1452566^2 + 15875^2 .

It is a cyclic number.

It is not a de Polignac number, because 2110199999981 - 2² = 2110199999977 is a prime.

It is a super-2 number, since 2×2110199999981² (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 (2110199992981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055099999990 + 1055099999991.

It is an arithmetic number, because the mean of its divisors is an integer number (1055099999991).

Almost surely, 2^{2110199999981} is an apocalyptic number.

It is an amenable number.

2110199999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2110199999981 is an equidigital number, since it uses as much as digits as its factorization.

2110199999981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8503056, while the sum is 68.

The spelling of 2110199999981 in words is "two trillion, one hundred ten billion, one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".