321543663106429 has 2 divisors, whose sum is σ = 321543663106430. Its totient is φ = 321543663106428.

The previous prime is 321543663106399. The next prime is 321543663106433. The reversal of 321543663106429 is 924601366345123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 313371354480804 + 8172308625625 = 17702298^2 + 2858725^2 .

It is a cyclic number.

It is not a de Polignac number, because 321543663106429 - 2⁵ = 321543663106397 is a prime.

It is a super-2 number, since 2×321543663106429² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 321543663106429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321543663106469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160771831553214 + 160771831553215.

It is an arithmetic number, because the mean of its divisors is an integer number (160771831553215).

Almost surely, 2^{321543663106429} is an apocalyptic number.

It is an amenable number.

321543663106429 is a deficient number, since it is larger than the sum of its proper divisors (1).

321543663106429 is an equidigital number, since it uses as much as digits as its factorization.

321543663106429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16796160, while the sum is 55.

The spelling of 321543663106429 in words is "three hundred twenty-one trillion, five hundred forty-three billion, six hundred sixty-three million, one hundred six thousand, four hundred twenty-nine".