212345205491 has 2 divisors, whose sum is σ = 212345205492. Its totient is φ = 212345205490.

The previous prime is 212345205407. The next prime is 212345205503. The reversal of 212345205491 is 194502543212.

212345205491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212345205491 is a prime.

It is not a weakly prime, because it can be changed into another prime (212345205991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106172602745 + 106172602746.

It is an arithmetic number, because the mean of its divisors is an integer number (106172602746).

Almost surely, 2^212345205491 is an apocalyptic number.

212345205491 is a deficient number, since it is larger than the sum of its proper divisors (1).

212345205491 is an equidigital number, since it uses as much as digits as its factorization.

212345205491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 212345205491 in words is "two hundred twelve billion, three hundred forty-five million, two hundred five thousand, four hundred ninety-one".