321103073 has 2 divisors, whose sum is σ = 321103074. Its totient is φ = 321103072.

The previous prime is 321103049. The next prime is 321103087. The reversal of 321103073 is 370301123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 319444129 + 1658944 = 17873^2 + 1288^2 .

It is a cyclic number.

It is not a de Polignac number, because 321103073 - 2⁶ = 321103009 is a prime.

It is a super-3 number, since 3×321103073³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (321103033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160551536 + 160551537.

It is an arithmetic number, because the mean of its divisors is an integer number (160551537).

Almost surely, 2^321103073 is an apocalyptic number.

It is an amenable number.

321103073 is a deficient number, since it is larger than the sum of its proper divisors (1).

321103073 is an equidigital number, since it uses as much as digits as its factorization.

321103073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 20.

The square root of 321103073 is about 17919.3491232243. The cubic root of 321103073 is about 684.7754057946.

Adding to 321103073 its reverse (370301123), we get a palindrome (691404196).

The spelling of 321103073 in words is "three hundred twenty-one million, one hundred three thousand, seventy-three".