321203099999909 has 2 divisors, whose sum is σ = 321203099999910. Its totient is φ = 321203099999908.

The previous prime is 321203099999863. The next prime is 321203099999911. The reversal of 321203099999909 is 909999990302123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179922062731009 + 141281037268900 = 13413503^2 + 11886170^2 .

It is a cyclic number.

It is not a de Polignac number, because 321203099999909 - 2²⁸ = 321202831564453 is a prime.

Together with 321203099999911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321203099999989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160601549999954 + 160601549999955.

It is an arithmetic number, because the mean of its divisors is an integer number (160601549999955).

Almost surely, 2^{321203099999909} is an apocalyptic number.

It is an amenable number.

321203099999909 is a deficient number, since it is larger than the sum of its proper divisors (1).

321203099999909 is an equidigital number, since it uses as much as digits as its factorization.

321203099999909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172186884, while the sum is 74.

The spelling of 321203099999909 in words is "three hundred twenty-one trillion, two hundred three billion, ninety-nine million, nine hundred ninety-nine thousand, nine hundred nine".