212168523641 has 2 divisors, whose sum is σ = 212168523642. Its totient is φ = 212168523640.

The previous prime is 212168523631. The next prime is 212168523649. The reversal of 212168523641 is 146325861212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210225918016 + 1942605625 = 458504^2 + 44075^2 .

It is a cyclic number.

It is not a de Polignac number, because 212168523641 - 2¹⁰ = 212168522617 is a prime.

It is not a weakly prime, because it can be changed into another prime (212168523649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106084261820 + 106084261821.

It is an arithmetic number, because the mean of its divisors is an integer number (106084261821).

Almost surely, 2^212168523641 is an apocalyptic number.

It is an amenable number.

212168523641 is a deficient number, since it is larger than the sum of its proper divisors (1).

212168523641 is an equidigital number, since it uses as much as digits as its factorization.

212168523641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 41.

The spelling of 212168523641 in words is "two hundred twelve billion, one hundred sixty-eight million, five hundred twenty-three thousand, six hundred forty-one".