321131213209 has 2 divisors, whose sum is σ = 321131213210. Its totient is φ = 321131213208.

The previous prime is 321131213177. The next prime is 321131213237. The reversal of 321131213209 is 902312131123.

It is an a-pointer prime, because the next prime (321131213237) can be obtained adding 321131213209 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245418187609 + 75713025600 = 495397^2 + 275160^2 .

It is a cyclic number.

It is not a de Polignac number, because 321131213209 - 2⁵ = 321131213177 is a prime.

It is not a weakly prime, because it can be changed into another prime (321131213269) 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, 160565606604 + 160565606605.

It is an arithmetic number, because the mean of its divisors is an integer number (160565606605).

Almost surely, 2^321131213209 is an apocalyptic number.

It is an amenable number.

321131213209 is a deficient number, since it is larger than the sum of its proper divisors (1).

321131213209 is an equidigital number, since it uses as much as digits as its factorization.

321131213209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The spelling of 321131213209 in words is "three hundred twenty-one billion, one hundred thirty-one million, two hundred thirteen thousand, two hundred nine".