211115827244821 has 2 divisors, whose sum is σ = 211115827244822. Its totient is φ = 211115827244820.

The previous prime is 211115827244753. The next prime is 211115827244827. The reversal of 211115827244821 is 128442728511112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202975156894225 + 8140670350596 = 14246935^2 + 2853186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211115827244821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211115827244827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105557913622410 + 105557913622411.

It is an arithmetic number, because the mean of its divisors is an integer number (105557913622411).

Almost surely, 2^{211115827244821} is an apocalyptic number.

It is an amenable number.

211115827244821 is a deficient number, since it is larger than the sum of its proper divisors (1).

211115827244821 is an equidigital number, since it uses as much as digits as its factorization.

211115827244821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 573440, while the sum is 49.

The spelling of 211115827244821 in words is "two hundred eleven trillion, one hundred fifteen billion, eight hundred twenty-seven million, two hundred forty-four thousand, eight hundred twenty-one".