121988650474877 has 2 divisors, whose sum is σ = 121988650474878. Its totient is φ = 121988650474876.

The previous prime is 121988650474861. The next prime is 121988650474909. The reversal of 121988650474877 is 778474056889121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66517302002596 + 55471348472281 = 8155814^2 + 7447909^2 .

It is a cyclic number.

It is not a de Polignac number, because 121988650474877 - 2⁴ = 121988650474861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121988650474798 and 121988650474807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121988650474477) 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, 60994325237438 + 60994325237439.

It is an arithmetic number, because the mean of its divisors is an integer number (60994325237439).

Almost surely, 2^{121988650474877} is an apocalyptic number.

It is an amenable number.

121988650474877 is a deficient number, since it is larger than the sum of its proper divisors (1).

121988650474877 is an equidigital number, since it uses as much as digits as its factorization.

121988650474877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1517322240, while the sum is 77.

The spelling of 121988650474877 in words is "one hundred twenty-one trillion, nine hundred eighty-eight billion, six hundred fifty million, four hundred seventy-four thousand, eight hundred seventy-seven".