212010023209 has 2 divisors, whose sum is σ = 212010023210.
Its totient is φ = 212010023208.
The previous prime is 212010023177. The next prime is 212010023287. The reversal of 212010023209 is 902320010212.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 207756374809 + 4253648400 = 455803^2 + 65220^2
It is a cyclic number.
It is not a de Polignac number, because 212010023209 - 25 = 212010023177 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 212010023209.
It is not a weakly prime, because it can be changed into another prime (212010023809) 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, 106005011604 + 106005011605.
It is an arithmetic number, because the mean of its divisors is an integer number (106005011605).
Almost surely, 2212010023209 is an apocalyptic number.
It is an amenable number.
212010023209 is a deficient number, since it is larger than the sum of its proper divisors (1).
212010023209 is an equidigital number, since it uses as much as digits as its factorization.
212010023209 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 432, while the sum is 22.
The spelling of 212010023209 in words is "two hundred twelve billion, ten million, twenty-three thousand, two hundred nine".