211210212119981 has 2 divisors, whose sum is σ = 211210212119982. Its totient is φ = 211210212119980.

The previous prime is 211210212119971. The next prime is 211210212120029. The reversal of 211210212119981 is 189911212012112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132679758568900 + 78530453551081 = 11518670^2 + 8861741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211210212119981 is a prime.

It is a super-2 number, since 2×211210212119981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211210212119971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605106059990 + 105605106059991.

It is an arithmetic number, because the mean of its divisors is an integer number (105605106059991).

Almost surely, 2^{211210212119981} is an apocalyptic number.

It is an amenable number.

211210212119981 is a deficient number, since it is larger than the sum of its proper divisors (1).

211210212119981 is an equidigital number, since it uses as much as digits as its factorization.

211210212119981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 41.

The spelling of 211210212119981 in words is "two hundred eleven trillion, two hundred ten billion, two hundred twelve million, one hundred nineteen thousand, nine hundred eighty-one".