321320001601 has 2 divisors, whose sum is σ = 321320001602. Its totient is φ = 321320001600.

The previous prime is 321320001599. The next prime is 321320001617. The reversal of 321320001601 is 106100023123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 311002520976 + 10317480625 = 557676^2 + 101575^2 .

It is a cyclic number.

It is not a de Polignac number, because 321320001601 - 2¹ = 321320001599 is a prime.

Together with 321320001599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (321320001661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160660000800 + 160660000801.

It is an arithmetic number, because the mean of its divisors is an integer number (160660000801).

Almost surely, 2^321320001601 is an apocalyptic number.

It is an amenable number.

321320001601 is a deficient number, since it is larger than the sum of its proper divisors (1).

321320001601 is an equidigital number, since it uses as much as digits as its factorization.

321320001601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 321320001601 its reverse (106100023123), we get a palindrome (427420024724).

The spelling of 321320001601 in words is "three hundred twenty-one billion, three hundred twenty million, one thousand, six hundred one".