210020120209 has 2 divisors, whose sum is σ = 210020120210. Its totient is φ = 210020120208.

The previous prime is 210020120117. The next prime is 210020120227. The reversal of 210020120209 is 902021020012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189486090000 + 20534030209 = 435300^2 + 143297^2 .

It is a cyclic number.

It is not a de Polignac number, because 210020120209 - 2⁷ = 210020120081 is a prime.

It is not a weakly prime, because it can be changed into another prime (210020120269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010060104 + 105010060105.

It is an arithmetic number, because the mean of its divisors is an integer number (105010060105).

Almost surely, 2^210020120209 is an apocalyptic number.

It is an amenable number.

210020120209 is a deficient number, since it is larger than the sum of its proper divisors (1).

210020120209 is an equidigital number, since it uses as much as digits as its factorization.

210020120209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The spelling of 210020120209 in words is "two hundred ten billion, twenty million, one hundred twenty thousand, two hundred nine".