321961099487 has 2 divisors, whose sum is σ = 321961099488. Its totient is φ = 321961099486.

The previous prime is 321961099441. The next prime is 321961099541. The reversal of 321961099487 is 784990169123.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321961099487 - 2³² = 317666132191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321961099087) 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, 160980549743 + 160980549744.

It is an arithmetic number, because the mean of its divisors is an integer number (160980549744).

Almost surely, 2^321961099487 is an apocalyptic number.

321961099487 is a deficient number, since it is larger than the sum of its proper divisors (1).

321961099487 is an equidigital number, since it uses as much as digits as its factorization.

321961099487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 59.

The spelling of 321961099487 in words is "three hundred twenty-one billion, nine hundred sixty-one million, ninety-nine thousand, four hundred eighty-seven".