321999940987 has 2 divisors, whose sum is σ = 321999940988. Its totient is φ = 321999940986.

The previous prime is 321999940973. The next prime is 321999941009. The reversal of 321999940987 is 789049999123.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321999940987 - 2³¹ = 319852457339 is a prime.

It is not a weakly prime, because it can be changed into another prime (321999940937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160999970493 + 160999970494.

It is an arithmetic number, because the mean of its divisors is an integer number (160999970494).

Almost surely, 2^321999940987 is an apocalyptic number.

321999940987 is a deficient number, since it is larger than the sum of its proper divisors (1).

321999940987 is an equidigital number, since it uses as much as digits as its factorization.

321999940987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79361856, while the sum is 70.

The spelling of 321999940987 in words is "three hundred twenty-one billion, nine hundred ninety-nine million, nine hundred forty thousand, nine hundred eighty-seven".