211243895077 has 2 divisors, whose sum is σ = 211243895078. Its totient is φ = 211243895076.

The previous prime is 211243895063. The next prime is 211243895081. The reversal of 211243895077 is 770598342112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168630137316 + 42613757761 = 410646^2 + 206431^2 .

It is a cyclic number.

It is not a de Polignac number, because 211243895077 - 2⁷ = 211243894949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211243895077.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211243895377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105621947538 + 105621947539.

It is an arithmetic number, because the mean of its divisors is an integer number (105621947539).

Almost surely, 2^211243895077 is an apocalyptic number.

It is an amenable number.

211243895077 is a deficient number, since it is larger than the sum of its proper divisors (1).

211243895077 is an equidigital number, since it uses as much as digits as its factorization.

211243895077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 211243895077 in words is "two hundred eleven billion, two hundred forty-three million, eight hundred ninety-five thousand, seventy-seven".