20354654240321 has 2 divisors, whose sum is σ = 20354654240322. Its totient is φ = 20354654240320.

The previous prime is 20354654240303. The next prime is 20354654240329. The reversal of 20354654240321 is 12304245645302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17813464360000 + 2541189880321 = 4220600^2 + 1594111^2 .

It is a cyclic number.

It is not a de Polignac number, because 20354654240321 - 2³⁰ = 20353580498497 is a prime.

It is not a weakly prime, because it can be changed into another prime (20354654240329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177327120160 + 10177327120161.

It is an arithmetic number, because the mean of its divisors is an integer number (10177327120161).

Almost surely, 2^{20354654240321} is an apocalyptic number.

It is an amenable number.

20354654240321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20354654240321 is an equidigital number, since it uses as much as digits as its factorization.

20354654240321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 691200, while the sum is 41.

Adding to 20354654240321 its reverse (12304245645302), we get a palindrome (32658899885623).

The spelling of 20354654240321 in words is "twenty trillion, three hundred fifty-four billion, six hundred fifty-four million, two hundred forty thousand, three hundred twenty-one".