321404440213421 has 2 divisors, whose sum is σ = 321404440213422. Its totient is φ = 321404440213420.

The previous prime is 321404440213393. The next prime is 321404440213457. The reversal of 321404440213421 is 124312044404123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320711865064900 + 692575148521 = 17908430^2 + 832211^2 .

It is a cyclic number.

It is not a de Polignac number, because 321404440213421 - 2¹⁴ = 321404440197037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321404440213621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160702220106710 + 160702220106711.

It is an arithmetic number, because the mean of its divisors is an integer number (160702220106711).

Almost surely, 2^{321404440213421} is an apocalyptic number.

It is an amenable number.

321404440213421 is a deficient number, since it is larger than the sum of its proper divisors (1).

321404440213421 is an equidigital number, since it uses as much as digits as its factorization.

321404440213421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73728, while the sum is 35.

Adding to 321404440213421 its reverse (124312044404123), we get a palindrome (445716484617544).

The spelling of 321404440213421 in words is "three hundred twenty-one trillion, four hundred four billion, four hundred forty million, two hundred thirteen thousand, four hundred twenty-one".