211001001200981 has 2 divisors, whose sum is σ = 211001001200982. Its totient is φ = 211001001200980.

The previous prime is 211001001200929. The next prime is 211001001201007. The reversal of 211001001200981 is 189002100100112.

It is an a-pointer prime, because the next prime (211001001201007) can be obtained adding 211001001200981 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209843935252081 + 1157065948900 = 14485991^2 + 1075670^2 .

It is a cyclic number.

It is not a de Polignac number, because 211001001200981 - 2³⁰ = 210999927459157 is a prime.

It is a super-2 number, since 2×211001001200981² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211001001200981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211001001200911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105500500600490 + 105500500600491.

It is an arithmetic number, because the mean of its divisors is an integer number (105500500600491).

Almost surely, 2^{211001001200981} is an apocalyptic number.

It is an amenable number.

211001001200981 is a deficient number, since it is larger than the sum of its proper divisors (1).

211001001200981 is an equidigital number, since it uses as much as digits as its factorization.

211001001200981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 26.

The spelling of 211001001200981 in words is "two hundred eleven trillion, one billion, one million, two hundred thousand, nine hundred eighty-one".