121220976655543 has 2 divisors, whose sum is σ = 121220976655544. Its totient is φ = 121220976655542.

The previous prime is 121220976655517. The next prime is 121220976655579. The reversal of 121220976655543 is 345556679022121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121220976655543 - 2³³ = 121212386720951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121220976652543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610488327771 + 60610488327772.

It is an arithmetic number, because the mean of its divisors is an integer number (60610488327772).

Almost surely, 2^{121220976655543} is an apocalyptic number.

121220976655543 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220976655543 is an equidigital number, since it uses as much as digits as its factorization.

121220976655543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216000, while the sum is 58.

The spelling of 121220976655543 in words is "one hundred twenty-one trillion, two hundred twenty billion, nine hundred seventy-six million, six hundred fifty-five thousand, five hundred forty-three".