210211009 has 2 divisors, whose sum is σ = 210211010. Its totient is φ = 210211008.

The previous prime is 210210991. The next prime is 210211013. The reversal of 210211009 is 900112012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191961025 + 18249984 = 13855^2 + 4272^2 .

It is a cyclic number.

It is not a de Polignac number, because 210211009 - 2⁷ = 210210881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210210983 and 210211001.

It is not a weakly prime, because it can be changed into another prime (210211109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105105504 + 105105505.

It is an arithmetic number, because the mean of its divisors is an integer number (105105505).

Almost surely, 2^210211009 is an apocalyptic number.

It is an amenable number.

210211009 is a deficient number, since it is larger than the sum of its proper divisors (1).

210211009 is an equidigital number, since it uses as much as digits as its factorization.

210211009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 210211009 is about 14498.6554204174. The cubic root of 210211009 is about 594.5912113365.

The spelling of 210211009 in words is "two hundred ten million, two hundred eleven thousand, nine".