121804342255553 has 2 divisors, whose sum is σ = 121804342255554. Its totient is φ = 121804342255552.

The previous prime is 121804342255543. The next prime is 121804342255613. The reversal of 121804342255553 is 355552243408121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108386568126769 + 13417774128784 = 10410887^2 + 3663028^2 .

It is an emirp because it is prime and its reverse (355552243408121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121804342255553 - 2¹⁶ = 121804342190017 is a prime.

It is not a weakly prime, because it can be changed into another prime (121804342255543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60902171127776 + 60902171127777.

It is an arithmetic number, because the mean of its divisors is an integer number (60902171127777).

Almost surely, 2^{121804342255553} is an apocalyptic number.

It is an amenable number.

121804342255553 is a deficient number, since it is larger than the sum of its proper divisors (1).

121804342255553 is an equidigital number, since it uses as much as digits as its factorization.

121804342255553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760000, while the sum is 50.

The spelling of 121804342255553 in words is "one hundred twenty-one trillion, eight hundred four billion, three hundred forty-two million, two hundred fifty-five thousand, five hundred fifty-three".