321423032221 has 2 divisors, whose sum is σ = 321423032222. Its totient is φ = 321423032220.

The previous prime is 321423032201. The next prime is 321423032237. The reversal of 321423032221 is 122230324123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 258075176121 + 63347856100 = 508011^2 + 251690^2 .

It is an emirp because it is prime and its reverse (122230324123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321423032221 - 2⁷ = 321423032093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321423032201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160711516110 + 160711516111.

It is an arithmetic number, because the mean of its divisors is an integer number (160711516111).

Almost surely, 2^321423032221 is an apocalyptic number.

It is an amenable number.

321423032221 is a deficient number, since it is larger than the sum of its proper divisors (1).

321423032221 is an equidigital number, since it uses as much as digits as its factorization.

321423032221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 321423032221 its reverse (122230324123), we get a palindrome (443653356344).

The spelling of 321423032221 in words is "three hundred twenty-one billion, four hundred twenty-three million, thirty-two thousand, two hundred twenty-one".