321222001 has 2 divisors, whose sum is σ = 321222002. Its totient is φ = 321222000.

The previous prime is 321221993. The next prime is 321222023. The reversal of 321222001 is 100222123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 234824976 + 86397025 = 15324^2 + 9295^2 .

It is a cyclic number.

It is not a de Polignac number, because 321222001 - 2³ = 321221993 is a prime.

It is not a weakly prime, because it can be changed into another prime (321222901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160611000 + 160611001.

It is an arithmetic number, because the mean of its divisors is an integer number (160611001).

Almost surely, 2^321222001 is an apocalyptic number.

It is an amenable number.

321222001 is a deficient number, since it is larger than the sum of its proper divisors (1).

321222001 is an equidigital number, since it uses as much as digits as its factorization.

321222001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 321222001 is about 17922.6672401180. The cubic root of 321222001 is about 684.8599361984.

Adding to 321222001 its reverse (100222123), we get a palindrome (421444124).

The spelling of 321222001 in words is "three hundred twenty-one million, two hundred twenty-two thousand, one".