121456169281 has 2 divisors, whose sum is σ = 121456169282. Its totient is φ = 121456169280.

The previous prime is 121456169279. The next prime is 121456169489. The reversal of 121456169281 is 182961654121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97244809281 + 24211360000 = 311841^2 + 155600^2 .

It is a cyclic number.

It is not a de Polignac number, because 121456169281 - 2¹ = 121456169279 is a prime.

It is a super-2 number, since 2×121456169281² (a number of 23 digits) contains 22 as substring.

Together with 121456169279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (121456269281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60728084640 + 60728084641.

It is an arithmetic number, because the mean of its divisors is an integer number (60728084641).

Almost surely, 2^121456169281 is an apocalyptic number.

It is an amenable number.

121456169281 is a deficient number, since it is larger than the sum of its proper divisors (1).

121456169281 is an equidigital number, since it uses as much as digits as its factorization.

121456169281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 46.

The spelling of 121456169281 in words is "one hundred twenty-one billion, four hundred fifty-six million, one hundred sixty-nine thousand, two hundred eighty-one".