2101021020191 has 2 divisors, whose sum is σ = 2101021020192. Its totient is φ = 2101021020190.

The previous prime is 2101021020181. The next prime is 2101021020223. The reversal of 2101021020191 is 1910201201012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101021020191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101021020121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050510510095 + 1050510510096.

It is an arithmetic number, because the mean of its divisors is an integer number (1050510510096).

Almost surely, 2^{2101021020191} is an apocalyptic number.

2101021020191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101021020191 is an equidigital number, since it uses as much as digits as its factorization.

2101021020191 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.

The spelling of 2101021020191 in words is "two trillion, one hundred one billion, twenty-one million, twenty thousand, one hundred ninety-one".