212303121209 has 2 divisors, whose sum is σ = 212303121210. Its totient is φ = 212303121208.

The previous prime is 212303121197. The next prime is 212303121223. The reversal of 212303121209 is 902121303212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148111831609 + 64191289600 = 384853^2 + 253360^2 .

It is a cyclic number.

It is not a de Polignac number, because 212303121209 - 2⁴ = 212303121193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (212303121299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106151560604 + 106151560605.

It is an arithmetic number, because the mean of its divisors is an integer number (106151560605).

Almost surely, 2^212303121209 is an apocalyptic number.

It is an amenable number.

212303121209 is a deficient number, since it is larger than the sum of its proper divisors (1).

212303121209 is an equidigital number, since it uses as much as digits as its factorization.

212303121209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 212303121209 in words is "two hundred twelve billion, three hundred three million, one hundred twenty-one thousand, two hundred nine".