212101010191 has 4 divisors (see below), whose sum is σ = 242401154512. Its totient is φ = 181800865872.

The previous prime is 212101010183. The next prime is 212101010207. The reversal of 212101010191 is 191010101212.

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 212101010191 - 2³ = 212101010183 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 (212101010111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15150072150 + ... + 15150072163.

It is an arithmetic number, because the mean of its divisors is an integer number (60600288628).

Almost surely, 2^212101010191 is an apocalyptic number.

212101010191 is a deficient number, since it is larger than the sum of its proper divisors (30300144321).

212101010191 is an equidigital number, since it uses as much as digits as its factorization.

212101010191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30300144320.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 212101010191 in words is "two hundred twelve billion, one hundred one million, ten thousand, one hundred ninety-one".