121200212209957 has 2 divisors, whose sum is σ = 121200212209958. Its totient is φ = 121200212209956.

The previous prime is 121200212209891. The next prime is 121200212209961. The reversal of 121200212209957 is 759902212002121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115981139458116 + 5219072751841 = 10769454^2 + 2284529^2 .

It is a cyclic number.

It is not a de Polignac number, because 121200212209957 - 2¹⁹ = 121200211685669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121200212209057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600106104978 + 60600106104979.

It is an arithmetic number, because the mean of its divisors is an integer number (60600106104979).

Almost surely, 2^{121200212209957} is an apocalyptic number.

It is an amenable number.

121200212209957 is a deficient number, since it is larger than the sum of its proper divisors (1).

121200212209957 is an equidigital number, since it uses as much as digits as its factorization.

121200212209957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 121200212209957 in words is "one hundred twenty-one trillion, two hundred billion, two hundred twelve million, two hundred nine thousand, nine hundred fifty-seven".