321722242643 has 2 divisors, whose sum is σ = 321722242644. Its totient is φ = 321722242642.

The previous prime is 321722242627. The next prime is 321722242661. The reversal of 321722242643 is 346242227123.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321722242643 - 2⁴ = 321722242627 is a prime.

It is a super-2 number, since 2×321722242643² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 321722242597 and 321722242606.

It is not a weakly prime, because it can be changed into another prime (321722242613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160861121321 + 160861121322.

It is an arithmetic number, because the mean of its divisors is an integer number (160861121322).

Almost surely, 2^321722242643 is an apocalyptic number.

321722242643 is a deficient number, since it is larger than the sum of its proper divisors (1).

321722242643 is an equidigital number, since it uses as much as digits as its factorization.

321722242643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 38.

Adding to 321722242643 its reverse (346242227123), we get a palindrome (667964469766).

The spelling of 321722242643 in words is "three hundred twenty-one billion, seven hundred twenty-two million, two hundred forty-two thousand, six hundred forty-three".