121297937897 has 2 divisors, whose sum is σ = 121297937898. Its totient is φ = 121297937896.

The previous prime is 121297937879. The next prime is 121297937899. The reversal of 121297937897 is 798739792121.

Together with previous prime (121297937879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100907240281 + 20390697616 = 317659^2 + 142796^2 .

It is an emirp because it is prime and its reverse (798739792121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121297937897 - 2⁶ = 121297937833 is a prime.

Together with 121297937899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121297937899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60648968948 + 60648968949.

It is an arithmetic number, because the mean of its divisors is an integer number (60648968949).

Almost surely, 2^121297937897 is an apocalyptic number.

It is an amenable number.

121297937897 is a deficient number, since it is larger than the sum of its proper divisors (1).

121297937897 is an equidigital number, since it uses as much as digits as its factorization.

121297937897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24004512, while the sum is 65.

The spelling of 121297937897 in words is "one hundred twenty-one billion, two hundred ninety-seven million, nine hundred thirty-seven thousand, eight hundred ninety-seven".