212005606500491 has 2 divisors, whose sum is σ = 212005606500492. Its totient is φ = 212005606500490.

The previous prime is 212005606500473. The next prime is 212005606500557. The reversal of 212005606500491 is 194005606500212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212005606500491 is a prime.

It is not a weakly prime, because it can be changed into another prime (212005606505491) 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, 106002803250245 + 106002803250246.

It is an arithmetic number, because the mean of its divisors is an integer number (106002803250246).

Almost surely, 2^{212005606500491} is an apocalyptic number.

212005606500491 is a deficient number, since it is larger than the sum of its proper divisors (1).

212005606500491 is an equidigital number, since it uses as much as digits as its factorization.

212005606500491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 212005606500491 in words is "two hundred twelve trillion, five billion, six hundred six million, five hundred thousand, four hundred ninety-one".