211202122130981 has 2 divisors, whose sum is σ = 211202122130982. Its totient is φ = 211202122130980.

The previous prime is 211202122130971. The next prime is 211202122131043. The reversal of 211202122130981 is 189031221202112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126522925594081 + 84679196536900 = 11248241^2 + 9202130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211202122130981 is a prime.

It is a super-3 number, since 3×211202122130981³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211202122130911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105601061065490 + 105601061065491.

It is an arithmetic number, because the mean of its divisors is an integer number (105601061065491).

Almost surely, 2^{211202122130981} is an apocalyptic number.

It is an amenable number.

211202122130981 is a deficient number, since it is larger than the sum of its proper divisors (1).

211202122130981 is an equidigital number, since it uses as much as digits as its factorization.

211202122130981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 35.

The spelling of 211202122130981 in words is "two hundred eleven trillion, two hundred two billion, one hundred twenty-two million, one hundred thirty thousand, nine hundred eighty-one".