212068638781 has 2 divisors, whose sum is σ = 212068638782. Its totient is φ = 212068638780.

The previous prime is 212068638739. The next prime is 212068638797. The reversal of 212068638781 is 187836860212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210436882756 + 1631756025 = 458734^2 + 40395^2 .

It is a cyclic number.

It is not a de Polignac number, because 212068638781 - 2¹¹ = 212068636733 is a prime.

It is a super-2 number, since 2×212068638781² (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 (212068618781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106034319390 + 106034319391.

It is an arithmetic number, because the mean of its divisors is an integer number (106034319391).

Almost surely, 2^212068638781 is an apocalyptic number.

It is an amenable number.

212068638781 is a deficient number, since it is larger than the sum of its proper divisors (1).

212068638781 is an equidigital number, since it uses as much as digits as its factorization.

212068638781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1548288, while the sum is 52.

The spelling of 212068638781 in words is "two hundred twelve billion, sixty-eight million, six hundred thirty-eight thousand, seven hundred eighty-one".