321512054221 has 2 divisors, whose sum is σ = 321512054222. Its totient is φ = 321512054220.

The previous prime is 321512054219. The next prime is 321512054249. The reversal of 321512054221 is 122450215123.

It is a happy number.

It is an a-pointer prime, because the next prime (321512054249) can be obtained adding 321512054221 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 267449294025 + 54062760196 = 517155^2 + 232514^2 .

It is a cyclic number.

It is not a de Polignac number, because 321512054221 - 2¹ = 321512054219 is a prime.

Together with 321512054219, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 321512054221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321512054251) 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, 160756027110 + 160756027111.

It is an arithmetic number, because the mean of its divisors is an integer number (160756027111).

Almost surely, 2^321512054221 is an apocalyptic number.

It is an amenable number.

321512054221 is a deficient number, since it is larger than the sum of its proper divisors (1).

321512054221 is an equidigital number, since it uses as much as digits as its factorization.

321512054221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 321512054221 its reverse (122450215123), we get a palindrome (443962269344).

The spelling of 321512054221 in words is "three hundred twenty-one billion, five hundred twelve million, fifty-four thousand, two hundred twenty-one".