211270647961 has 2 divisors, whose sum is σ = 211270647962. Its totient is φ = 211270647960.

The previous prime is 211270647947. The next prime is 211270648031. The reversal of 211270647961 is 169746072112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153319233600 + 57951414361 = 391560^2 + 240731^2 .

It is a cyclic number.

It is not a de Polignac number, because 211270647961 - 2⁹ = 211270647449 is a prime.

It is not a weakly prime, because it can be changed into another prime (211270447961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105635323980 + 105635323981.

It is an arithmetic number, because the mean of its divisors is an integer number (105635323981).

Almost surely, 2^211270647961 is an apocalyptic number.

It is an amenable number.

211270647961 is a deficient number, since it is larger than the sum of its proper divisors (1).

211270647961 is an equidigital number, since it uses as much as digits as its factorization.

211270647961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 211270647961 in words is "two hundred eleven billion, two hundred seventy million, six hundred forty-seven thousand, nine hundred sixty-one".