321211493 has 2 divisors, whose sum is σ = 321211494. Its totient is φ = 321211492.

The previous prime is 321211441. The next prime is 321211567. The reversal of 321211493 is 394112123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185558884 + 135652609 = 13622^2 + 11647^2 .

It is a cyclic number.

It is not a de Polignac number, because 321211493 - 2²² = 317017189 is a prime.

It is equal to p_17337113 and since 321211493 and 17337113 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321211403) 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, 160605746 + 160605747.

It is an arithmetic number, because the mean of its divisors is an integer number (160605747).

Almost surely, 2^321211493 is an apocalyptic number.

It is an amenable number.

321211493 is a deficient number, since it is larger than the sum of its proper divisors (1).

321211493 is an equidigital number, since it uses as much as digits as its factorization.

321211493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 321211493 is about 17922.3740893889. The cubic root of 321211493 is about 684.8524682721.

The spelling of 321211493 in words is "three hundred twenty-one million, two hundred eleven thousand, four hundred ninety-three".