121988650474909 has 2 divisors, whose sum is σ = 121988650474910. Its totient is φ = 121988650474908.

The previous prime is 121988650474877. The next prime is 121988650474979. The reversal of 121988650474909 is 909474056889121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111499978016025 + 10488672458884 = 10559355^2 + 3238622^2 .

It is a cyclic number.

It is not a de Polignac number, because 121988650474909 - 2⁵ = 121988650474877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121988650474979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60994325237454 + 60994325237455.

It is an arithmetic number, because the mean of its divisors is an integer number (60994325237455).

Almost surely, 2^{121988650474909} is an apocalyptic number.

It is an amenable number.

121988650474909 is a deficient number, since it is larger than the sum of its proper divisors (1).

121988650474909 is an equidigital number, since it uses as much as digits as its factorization.

121988650474909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 313528320, while the sum is 73.

The spelling of 121988650474909 in words is "one hundred twenty-one trillion, nine hundred eighty-eight billion, six hundred fifty million, four hundred seventy-four thousand, nine hundred nine".