20010010110191 has 4 divisors (see below), whose sum is σ = 20010038193072. Its totient is φ = 20009982027312.

The previous prime is 20010010110163. The next prime is 20010010110227. The reversal of 20010010110191 is 19101101001002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20010010110191 - 2²⁶ = 20009943001327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010010110161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12944051 + ... + 14407236.

It is an arithmetic number, because the mean of its divisors is an integer number (5002509548268).

Almost surely, 2^{20010010110191} is an apocalyptic number.

20010010110191 is a deficient number, since it is larger than the sum of its proper divisors (28082881).

20010010110191 is an equidigital number, since it uses as much as digits as its factorization.

20010010110191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28082880.

The product of its (nonzero) digits is 18, while the sum is 17.

Adding to 20010010110191 its reverse (19101101001002), we get a palindrome (39111111111193).

The spelling of 20010010110191 in words is "twenty trillion, ten billion, ten million, one hundred ten thousand, one hundred ninety-one".