321233020991 has 2 divisors, whose sum is σ = 321233020992. Its totient is φ = 321233020990.

The previous prime is 321233020987. The next prime is 321233021023. The reversal of 321233020991 is 199020332123.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321233020991 - 2² = 321233020987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321235020991) 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, 160616510495 + 160616510496.

It is an arithmetic number, because the mean of its divisors is an integer number (160616510496).

Almost surely, 2^321233020991 is an apocalyptic number.

321233020991 is a deficient number, since it is larger than the sum of its proper divisors (1).

321233020991 is an equidigital number, since it uses as much as digits as its factorization.

321233020991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 35.

The spelling of 321233020991 in words is "three hundred twenty-one billion, two hundred thirty-three million, twenty thousand, nine hundred ninety-one".