321722242661 has 2 divisors, whose sum is σ = 321722242662. Its totient is φ = 321722242660.

The previous prime is 321722242643. The next prime is 321722242693. The reversal of 321722242661 is 166242227123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 321409624900 + 312617761 = 566930^2 + 17681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321722242661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321722242601) 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, 160861121330 + 160861121331.

It is an arithmetic number, because the mean of its divisors is an integer number (160861121331).

Almost surely, 2^321722242661 is an apocalyptic number.

It is an amenable number.

321722242661 is a deficient number, since it is larger than the sum of its proper divisors (1).

321722242661 is an equidigital number, since it uses as much as digits as its factorization.

321722242661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 38.

Adding to 321722242661 its reverse (166242227123), we get a palindrome (487964469784).

The spelling of 321722242661 in words is "three hundred twenty-one billion, seven hundred twenty-two million, two hundred forty-two thousand, six hundred sixty-one".