211011022811 has 2 divisors, whose sum is σ = 211011022812. Its totient is φ = 211011022810.

The previous prime is 211011022777. The next prime is 211011022919. The reversal of 211011022811 is 118220110112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211011022811 is a prime.

It is not a weakly prime, because it can be changed into another prime (211011022511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105505511405 + 105505511406.

It is an arithmetic number, because the mean of its divisors is an integer number (105505511406).

Almost surely, 2^211011022811 is an apocalyptic number.

211011022811 is a deficient number, since it is larger than the sum of its proper divisors (1).

211011022811 is an equidigital number, since it uses as much as digits as its factorization.

211011022811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 211011022811 its reverse (118220110112), we get a palindrome (329231132923).

The spelling of 211011022811 in words is "two hundred eleven billion, eleven million, twenty-two thousand, eight hundred eleven".