321213253261 has 2 divisors, whose sum is σ = 321213253262. Its totient is φ = 321213253260.

The previous prime is 321213253241. The next prime is 321213253307. The reversal of 321213253261 is 162352312123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175083664900 + 146129588361 = 418430^2 + 382269^2 .

It is an emirp because it is prime and its reverse (162352312123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321213253261 - 2¹³ = 321213245069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321213253241) 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, 160606626630 + 160606626631.

It is an arithmetic number, because the mean of its divisors is an integer number (160606626631).

Almost surely, 2^321213253261 is an apocalyptic number.

It is an amenable number.

321213253261 is a deficient number, since it is larger than the sum of its proper divisors (1).

321213253261 is an equidigital number, since it uses as much as digits as its factorization.

321213253261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

Adding to 321213253261 its reverse (162352312123), we get a palindrome (483565565384).

The spelling of 321213253261 in words is "three hundred twenty-one billion, two hundred thirteen million, two hundred fifty-three thousand, two hundred sixty-one".