1210120210109 has 2 divisors, whose sum is σ = 1210120210110. Its totient is φ = 1210120210108.

The previous prime is 1210120210099. The next prime is 1210120210121. The reversal of 1210120210109 is 9010120210121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1206899988100 + 3220222009 = 1098590^2 + 56747^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210120210109 - 2⁸ = 1210120209853 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 (1210120210909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605060105054 + 605060105055.

It is an arithmetic number, because the mean of its divisors is an integer number (605060105055).

Almost surely, 2^{1210120210109} is an apocalyptic number.

It is an amenable number.

1210120210109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210120210109 is an equidigital number, since it uses as much as digits as its factorization.

1210120210109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1210120210109 in words is "one trillion, two hundred ten billion, one hundred twenty million, two hundred ten thousand, one hundred nine".