211010122009 has 2 divisors, whose sum is σ = 211010122010. Its totient is φ = 211010122008.

The previous prime is 211010121913. The next prime is 211010122031. The reversal of 211010122009 is 900221010112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209166278409 + 1843843600 = 457347^2 + 42940^2 .

It is a cyclic number.

It is not a de Polignac number, because 211010122009 - 2¹¹ = 211010119961 is a prime.

It is not a weakly prime, because it can be changed into another prime (211010122079) 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, 105505061004 + 105505061005.

It is an arithmetic number, because the mean of its divisors is an integer number (105505061005).

Almost surely, 2^211010122009 is an apocalyptic number.

It is an amenable number.

211010122009 is a deficient number, since it is larger than the sum of its proper divisors (1).

211010122009 is an equidigital number, since it uses as much as digits as its factorization.

211010122009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 211010122009 in words is "two hundred eleven billion, ten million, one hundred twenty-two thousand, nine".