18191020110201 has 32 divisors (see below), whose sum is σ = 27613116579840. Its totient is φ = 11829542130000.

The previous prime is 18191020110187. The next prime is 18191020110229. The reversal of 18191020110201 is 10201102019181.

It is not a de Polignac number, because 18191020110201 - 2¹³ = 18191020102009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18191020150201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9559785 + ... + 11303606.

It is an arithmetic number, because the mean of its divisors is an integer number (862909893120).

Almost surely, 2^{18191020110201} is an apocalyptic number.

It is an amenable number.

18191020110201 is a deficient number, since it is larger than the sum of its proper divisors (9422096469639).

18191020110201 is a wasteful number, since it uses less digits than its factorization.

18191020110201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20864194 (or 20864188 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 27.

Adding to 18191020110201 its reverse (10201102019181), we get a palindrome (28392122129382).

The spelling of 18191020110201 in words is "eighteen trillion, one hundred ninety-one billion, twenty million, one hundred ten thousand, two hundred one".