20321410443409 has 2 divisors, whose sum is σ = 20321410443410. Its totient is φ = 20321410443408.

The previous prime is 20321410443407. The next prime is 20321410443413. The reversal of 20321410443409 is 90434401412302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18624161687184 + 1697248756225 = 4315572^2 + 1302785^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321410443409 - 2¹ = 20321410443407 is a prime.

Together with 20321410443407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20321410443407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160705221704 + 10160705221705.

It is an arithmetic number, because the mean of its divisors is an integer number (10160705221705).

Almost surely, 2^{20321410443409} is an apocalyptic number.

It is an amenable number.

20321410443409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321410443409 is an equidigital number, since it uses as much as digits as its factorization.

20321410443409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 20321410443409 in words is "twenty trillion, three hundred twenty-one billion, four hundred ten million, four hundred forty-three thousand, four hundred nine".