211020122191 has 2 divisors, whose sum is σ = 211020122192. Its totient is φ = 211020122190.

The previous prime is 211020122179. The next prime is 211020122263. The reversal of 211020122191 is 191221020112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211020122191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211020122141) 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 as a sum of consecutive naturals, namely, 105510061095 + 105510061096.

It is an arithmetic number, because the mean of its divisors is an integer number (105510061096).

Almost surely, 2^211020122191 is an apocalyptic number.

211020122191 is a deficient number, since it is larger than the sum of its proper divisors (1).

211020122191 is an equidigital number, since it uses as much as digits as its factorization.

211020122191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 211020122191 in words is "two hundred eleven billion, twenty million, one hundred twenty-two thousand, one hundred ninety-one".