321966436901 has 2 divisors, whose sum is σ = 321966436902. Its totient is φ = 321966436900.

The previous prime is 321966436861. The next prime is 321966436931. The reversal of 321966436901 is 109634669123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 264246374401 + 57720062500 = 514049^2 + 240250^2 .

It is a cyclic number.

It is not a de Polignac number, because 321966436901 - 2³⁴ = 304786567717 is a prime.

It is a super-2 number, since 2×321966436901² (a number of 24 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 321966436901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321966436931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160983218450 + 160983218451.

It is an arithmetic number, because the mean of its divisors is an integer number (160983218451).

Almost surely, 2^321966436901 is an apocalyptic number.

It is an amenable number.

321966436901 is a deficient number, since it is larger than the sum of its proper divisors (1).

321966436901 is an equidigital number, since it uses as much as digits as its factorization.

321966436901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 50.

The spelling of 321966436901 in words is "three hundred twenty-one billion, nine hundred sixty-six million, four hundred thirty-six thousand, nine hundred one".