321158909891 has 2 divisors, whose sum is σ = 321158909892. Its totient is φ = 321158909890.

The previous prime is 321158909857. The next prime is 321158909923. The reversal of 321158909891 is 198909851123.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 321158909891 - 2¹⁰ = 321158908867 is a prime.

It is not a weakly prime, because it can be changed into another prime (321158009891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160579454945 + 160579454946.

It is an arithmetic number, because the mean of its divisors is an integer number (160579454946).

Almost surely, 2^321158909891 is an apocalyptic number.

321158909891 is a deficient number, since it is larger than the sum of its proper divisors (1).

321158909891 is an equidigital number, since it uses as much as digits as its factorization.

321158909891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 56.

The spelling of 321158909891 in words is "three hundred twenty-one billion, one hundred fifty-eight million, nine hundred nine thousand, eight hundred ninety-one".