121131550423129 has 2 divisors, whose sum is σ = 121131550423130. Its totient is φ = 121131550423128.

The previous prime is 121131550423127. The next prime is 121131550423157. The reversal of 121131550423129 is 921324055131121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107171254046025 + 13960296377104 = 10352355^2 + 3736348^2 .

It is an emirp because it is prime and its reverse (921324055131121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121131550423129 - 2¹ = 121131550423127 is a prime.

It is a super-2 number, since 2×121131550423129² (a number of 29 digits) contains 22 as substring.

Together with 121131550423127, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 121131550423091 and 121131550423100.

It is not a weakly prime, because it can be changed into another prime (121131550423123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60565775211564 + 60565775211565.

It is an arithmetic number, because the mean of its divisors is an integer number (60565775211565).

Almost surely, 2^{121131550423129} is an apocalyptic number.

It is an amenable number.

121131550423129 is a deficient number, since it is larger than the sum of its proper divisors (1).

121131550423129 is an equidigital number, since it uses as much as digits as its factorization.

121131550423129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 121131550423129 in words is "one hundred twenty-one trillion, one hundred thirty-one billion, five hundred fifty million, four hundred twenty-three thousand, one hundred twenty-nine".