212101012122191 has 2 divisors, whose sum is σ = 212101012122192. Its totient is φ = 212101012122190.

The previous prime is 212101012122187. The next prime is 212101012122257. The reversal of 212101012122191 is 191221210101212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212101012122191 - 2² = 212101012122187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212101012122191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212101012122491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050506061095 + 106050506061096.

It is an arithmetic number, because the mean of its divisors is an integer number (106050506061096).

Almost surely, 2^{212101012122191} is an apocalyptic number.

212101012122191 is a deficient number, since it is larger than the sum of its proper divisors (1).

212101012122191 is an equidigital number, since it uses as much as digits as its factorization.

212101012122191 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 26.

The spelling of 212101012122191 in words is "two hundred twelve trillion, one hundred one billion, twelve million, one hundred twenty-two thousand, one hundred ninety-one".