20840190211 has 2 divisors, whose sum is σ = 20840190212. Its totient is φ = 20840190210.

The previous prime is 20840190187. The next prime is 20840190229. The reversal of 20840190211 is 11209104802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20840190211 - 2¹³ = 20840182019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20840190211.

It is not a weakly prime, because it can be changed into another prime (20840190281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420095105 + 10420095106.

It is an arithmetic number, because the mean of its divisors is an integer number (10420095106).

Almost surely, 2^20840190211 is an apocalyptic number.

20840190211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20840190211 is an equidigital number, since it uses as much as digits as its factorization.

20840190211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 20840190211 in words is "twenty billion, eight hundred forty million, one hundred ninety thousand, two hundred eleven".