210120220109 has 2 divisors, whose sum is σ = 210120220110. Its totient is φ = 210120220108.

The previous prime is 210120220091. The next prime is 210120220129. The reversal of 210120220109 is 901022021012.

It is a happy number.

Together with previous prime (210120220091) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (210120220129) can be obtained adding 210120220109 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209875766884 + 244453225 = 458122^2 + 15635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210120220109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210120220129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060110054 + 105060110055.

It is an arithmetic number, because the mean of its divisors is an integer number (105060110055).

Almost surely, 2^210120220109 is an apocalyptic number.

It is an amenable number.

210120220109 is a deficient number, since it is larger than the sum of its proper divisors (1).

210120220109 is an equidigital number, since it uses as much as digits as its factorization.

210120220109 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 20.

The spelling of 210120220109 in words is "two hundred ten billion, one hundred twenty million, two hundred twenty thousand, one hundred nine".