211210198957 has 2 divisors, whose sum is σ = 211210198958. Its totient is φ = 211210198956.

The previous prime is 211210198939. The next prime is 211210198963. The reversal of 211210198957 is 759891012112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121294779076 + 89915419881 = 348274^2 + 299859^2 .

It is a cyclic number.

It is not a de Polignac number, because 211210198957 - 2²⁷ = 211075981229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211210198937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605099478 + 105605099479.

It is an arithmetic number, because the mean of its divisors is an integer number (105605099479).

Almost surely, 2^211210198957 is an apocalyptic number.

It is an amenable number.

211210198957 is a deficient number, since it is larger than the sum of its proper divisors (1).

211210198957 is an equidigital number, since it uses as much as digits as its factorization.

211210198957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 46.

The spelling of 211210198957 in words is "two hundred eleven billion, two hundred ten million, one hundred ninety-eight thousand, nine hundred fifty-seven".