321999988851 has 16 divisors (see below), whose sum is σ = 480075479200. Its totient is φ = 213299352864.

The previous prime is 321999988769. The next prime is 321999988913. The reversal of 321999988851 is 158889999123.

It is a happy number.

321999988851 is a `hidden beast` number, since 321 + 9 + 99 + 98 + 88 + 51 = 666.

It is not a de Polignac number, because 321999988851 - 2¹⁸ = 321999726707 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321999988851.

It is not an unprimeable number, because it can be changed into a prime (321999984851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37976416 + ... + 37984893.

It is an arithmetic number, because the mean of its divisors is an integer number (30004717450).

Almost surely, 2^321999988851 is an apocalyptic number.

321999988851 is a deficient number, since it is larger than the sum of its proper divisors (158075490349).

321999988851 is a wasteful number, since it uses less digits than its factorization.

321999988851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75961475 (or 75961469 counting only the distinct ones).

The product of its digits is 100776960, while the sum is 72.

The spelling of 321999988851 in words is "three hundred twenty-one billion, nine hundred ninety-nine million, nine hundred eighty-eight thousand, eight hundred fifty-one".