2019181918201 has 12 divisors (see below), whose sum is σ = 2487011583348. Its totient is φ = 1628919866112.

The previous prime is 2019181918183. The next prime is 2019181918211. The reversal of 2019181918201 is 1028191819102.

It can be written as a sum of positive squares in 2 ways, for example, as 789076890000 + 1230105028201 = 888300^2 + 1109101^2 .

It is not a de Polignac number, because 2019181918201 - 2⁹ = 2019181917689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2019181918211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1211993116 + ... + 1211994781.

It is an arithmetic number, because the mean of its divisors is an integer number (207250965279).

Almost surely, 2^{2019181918201} is an apocalyptic number.

It is an amenable number.

2019181918201 is a deficient number, since it is larger than the sum of its proper divisors (467829665147).

2019181918201 is a wasteful number, since it uses less digits than its factorization.

2019181918201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423987928 (or 2423987921 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 43.

Subtracting from 2019181918201 its reverse (1028191819102), we obtain a palindrome (990990099099).

The spelling of 2019181918201 in words is "two trillion, nineteen billion, one hundred eighty-one million, nine hundred eighteen thousand, two hundred one".