321321001 has 2 divisors, whose sum is σ = 321321002. Its totient is φ = 321321000.

The previous prime is 321320981. The next prime is 321321023. The reversal of 321321001 is 100123123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 321305625 + 15376 = 17925^2 + 124^2 .

It is an emirp because it is prime and its reverse (100123123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321321001 - 2⁵ = 321320969 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (321321071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160660500 + 160660501.

It is an arithmetic number, because the mean of its divisors is an integer number (160660501).

Almost surely, 2^321321001 is an apocalyptic number.

It is an amenable number.

321321001 is a deficient number, since it is larger than the sum of its proper divisors (1).

321321001 is an equidigital number, since it uses as much as digits as its factorization.

321321001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 321321001 is about 17925.4288930558. The cubic root of 321321001 is about 684.9302864746.

Adding to 321321001 its reverse (100123123), we get a palindrome (421444124).

It can be divided in two parts, 32132 and 1001, that added together give a palindrome (33133).

The spelling of 321321001 in words is "three hundred twenty-one million, three hundred twenty-one thousand, one".