20202101100191 has 2 divisors, whose sum is σ = 20202101100192. Its totient is φ = 20202101100190.

The previous prime is 20202101100187. The next prime is 20202101100211. The reversal of 20202101100191 is 19100110120202.

It is an a-pointer prime, because the next prime (20202101100211) can be obtained adding 20202101100191 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20202101100191 - 2² = 20202101100187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20202101100091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101050550095 + 10101050550096.

It is an arithmetic number, because the mean of its divisors is an integer number (10101050550096).

Almost surely, 2^{20202101100191} is an apocalyptic number.

20202101100191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202101100191 is an equidigital number, since it uses as much as digits as its factorization.

20202101100191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 20202101100191 its reverse (19100110120202), we get a palindrome (39302211220393).

The spelling of 20202101100191 in words is "twenty trillion, two hundred two billion, one hundred one million, one hundred thousand, one hundred ninety-one".