212234218981 has 2 divisors, whose sum is σ = 212234218982. Its totient is φ = 212234218980.

The previous prime is 212234218939. The next prime is 212234219009. The reversal of 212234218981 is 189812432212.

212234218981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176412600225 + 35821618756 = 420015^2 + 189266^2 .

It is a cyclic number.

It is not a de Polignac number, because 212234218981 - 2¹³ = 212234210789 is a prime.

It is a super-2 number, since 2×212234218981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212234218381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106117109490 + 106117109491.

It is an arithmetic number, because the mean of its divisors is an integer number (106117109491).

Almost surely, 2^212234218981 is an apocalyptic number.

It is an amenable number.

212234218981 is a deficient number, since it is larger than the sum of its proper divisors (1).

212234218981 is an equidigital number, since it uses as much as digits as its factorization.

212234218981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 43.

The spelling of 212234218981 in words is "two hundred twelve billion, two hundred thirty-four million, two hundred eighteen thousand, nine hundred eighty-one".