211212121112281 has 2 divisors, whose sum is σ = 211212121112282. Its totient is φ = 211212121112280.

The previous prime is 211212121112243. The next prime is 211212121112327. The reversal of 211212121112281 is 182211121212112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203537559022281 + 7674562090000 = 14266659^2 + 2770300^2 .

It is a cyclic number.

It is not a de Polignac number, because 211212121112281 - 2⁴¹ = 209013097856729 is a prime.

It is a super-2 number, since 2×211212121112281² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211212121119281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105606060556140 + 105606060556141.

It is an arithmetic number, because the mean of its divisors is an integer number (105606060556141).

Almost surely, 2^{211212121112281} is an apocalyptic number.

It is an amenable number.

211212121112281 is a deficient number, since it is larger than the sum of its proper divisors (1).

211212121112281 is an equidigital number, since it uses as much as digits as its factorization.

211212121112281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 512, while the sum is 28.

Adding to 211212121112281 its reverse (182211121212112), we get a palindrome (393423242324393).

The spelling of 211212121112281 in words is "two hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, one hundred twelve thousand, two hundred eighty-one".