210020020709 has 2 divisors, whose sum is σ = 210020020710. Its totient is φ = 210020020708.

The previous prime is 210020020669. The next prime is 210020020733. The reversal of 210020020709 is 907020020012.

210020020709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136319716225 + 73700304484 = 369215^2 + 271478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210020020709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210020020789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010010354 + 105010010355.

It is an arithmetic number, because the mean of its divisors is an integer number (105010010355).

Almost surely, 2^210020020709 is an apocalyptic number.

It is an amenable number.

210020020709 is a deficient number, since it is larger than the sum of its proper divisors (1).

210020020709 is an equidigital number, since it uses as much as digits as its factorization.

210020020709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The spelling of 210020020709 in words is "two hundred ten billion, twenty million, twenty thousand, seven hundred nine".