121909319237 has 2 divisors, whose sum is σ = 121909319238. Its totient is φ = 121909319236.

The previous prime is 121909319227. The next prime is 121909319239. The reversal of 121909319237 is 732913909121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80891323396 + 41017995841 = 284414^2 + 202529^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121909319237 is a prime.

Together with 121909319239, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121909319191 and 121909319200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121909319239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60954659618 + 60954659619.

It is an arithmetic number, because the mean of its divisors is an integer number (60954659619).

Almost surely, 2^121909319237 is an apocalyptic number.

It is an amenable number.

121909319237 is a deficient number, since it is larger than the sum of its proper divisors (1).

121909319237 is an equidigital number, since it uses as much as digits as its factorization.

121909319237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183708, while the sum is 47.

The spelling of 121909319237 in words is "one hundred twenty-one billion, nine hundred nine million, three hundred nineteen thousand, two hundred thirty-seven".