209303902123 has 2 divisors, whose sum is σ = 209303902124. Its totient is φ = 209303902122.

The previous prime is 209303902081. The next prime is 209303902189. The reversal of 209303902123 is 321209303902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209303902123 - 2²⁹ = 208767031211 is a prime.

It is not a weakly prime, because it can be changed into another prime (209303962123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104651951061 + 104651951062.

It is an arithmetic number, because the mean of its divisors is an integer number (104651951062).

Almost surely, 2^209303902123 is an apocalyptic number.

209303902123 is a deficient number, since it is larger than the sum of its proper divisors (1).

209303902123 is an equidigital number, since it uses as much as digits as its factorization.

209303902123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 34.

The spelling of 209303902123 in words is "two hundred nine billion, three hundred three million, nine hundred two thousand, one hundred twenty-three".