321002001 has 8 divisors (see below), whose sum is σ = 475558560. Its totient is φ = 214001316.

The previous prime is 321001999. The next prime is 321002023. The reversal of 321002001 is 100200123.

It is a happy number.

It is not a de Polignac number, because 321002001 - 2¹ = 321001999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (321002051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5944455 + ... + 5944508.

It is an arithmetic number, because the mean of its divisors is an integer number (59444820).

Almost surely, 2^321002001 is an apocalyptic number.

It is an amenable number.

321002001 is a deficient number, since it is larger than the sum of its proper divisors (154556559).

321002001 is a wasteful number, since it uses less digits than its factorization.

321002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11888972 (or 11888966 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 321002001 is about 17916.5287095464. The cubic root of 321002001 is about 684.7035504842.

Adding to 321002001 its reverse (100200123), we get a palindrome (421202124).

The spelling of 321002001 in words is "three hundred twenty-one million, two thousand, one".