211955605811 has 2 divisors, whose sum is σ = 211955605812. Its totient is φ = 211955605810.

The previous prime is 211955605801. The next prime is 211955605831. The reversal of 211955605811 is 118506559112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211955605811 is a prime.

It is not a weakly prime, because it can be changed into another prime (211955605801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105977802905 + 105977802906.

It is an arithmetic number, because the mean of its divisors is an integer number (105977802906).

Almost surely, 2^211955605811 is an apocalyptic number.

211955605811 is a deficient number, since it is larger than the sum of its proper divisors (1).

211955605811 is an equidigital number, since it uses as much as digits as its factorization.

211955605811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 44.

The spelling of 211955605811 in words is "two hundred eleven billion, nine hundred fifty-five million, six hundred five thousand, eight hundred eleven".