321000001001 has 4 divisors (see below), whose sum is σ = 323527560192. Its totient is φ = 318472441812.

The previous prime is 321000000991. The next prime is 321000001031. The reversal of 321000001001 is 100100000123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321000001001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 321000001001.

It is not an unprimeable number, because it can be changed into a prime (321000001031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1263779405 + ... + 1263779658.

It is an arithmetic number, because the mean of its divisors is an integer number (80881890048).

Almost surely, 2^321000001001 is an apocalyptic number.

It is an amenable number.

321000001001 is a deficient number, since it is larger than the sum of its proper divisors (2527559191).

321000001001 is a wasteful number, since it uses less digits than its factorization.

321000001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527559190.

The product of its (nonzero) digits is 6, while the sum is 8.

Adding to 321000001001 its reverse (100100000123), we get a palindrome (421100001124).

The spelling of 321000001001 in words is "three hundred twenty-one billion, one thousand, one".