21100202220191 has 2 divisors, whose sum is σ = 21100202220192. Its totient is φ = 21100202220190.

The previous prime is 21100202220187. The next prime is 21100202220239. The reversal of 21100202220191 is 19102220200112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21100202220191 - 2² = 21100202220187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100202220491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550101110095 + 10550101110096.

It is an arithmetic number, because the mean of its divisors is an integer number (10550101110096).

Almost surely, 2^{21100202220191} is an apocalyptic number.

21100202220191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100202220191 is an equidigital number, since it uses as much as digits as its factorization.

21100202220191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21100202220191 in words is "twenty-one trillion, one hundred billion, two hundred two million, two hundred twenty thousand, one hundred ninety-one".