20209484240321 has 2 divisors, whose sum is σ = 20209484240322. Its totient is φ = 20209484240320.

The previous prime is 20209484240317. The next prime is 20209484240329. The reversal of 20209484240321 is 12304248490202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15409393230400 + 4800091009921 = 3925480^2 + 2190911^2 .

It is a cyclic number.

It is not a de Polignac number, because 20209484240321 - 2² = 20209484240317 is a prime.

It is not a weakly prime, because it can be changed into another prime (20209484240329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10104742120160 + 10104742120161.

It is an arithmetic number, because the mean of its divisors is an integer number (10104742120161).

Almost surely, 2^{20209484240321} is an apocalyptic number.

It is an amenable number.

20209484240321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20209484240321 is an equidigital number, since it uses as much as digits as its factorization.

20209484240321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 221184, while the sum is 41.

The spelling of 20209484240321 in words is "twenty trillion, two hundred nine billion, four hundred eighty-four million, two hundred forty thousand, three hundred twenty-one".