21212132113169 has 2 divisors, whose sum is σ = 21212132113170. Its totient is φ = 21212132113168.

The previous prime is 21212132113163. The next prime is 21212132113217. The reversal of 21212132113169 is 96131123121212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21199467986944 + 12664126225 = 4604288^2 + 112535^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212132113169 - 2⁴ = 21212132113153 is a prime.

It is a super-2 number, since 2×21212132113169² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21212132113163) 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, 10606066056584 + 10606066056585.

It is an arithmetic number, because the mean of its divisors is an integer number (10606066056585).

Almost surely, 2^{21212132113169} is an apocalyptic number.

It is an amenable number.

21212132113169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212132113169 is an equidigital number, since it uses as much as digits as its factorization.

21212132113169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The spelling of 21212132113169 in words is "twenty-one trillion, two hundred twelve billion, one hundred thirty-two million, one hundred thirteen thousand, one hundred sixty-nine".