121842113893 has 2 divisors, whose sum is σ = 121842113894. Its totient is φ = 121842113892.

The previous prime is 121842113867. The next prime is 121842113933. The reversal of 121842113893 is 398311248121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82186569124 + 39655544769 = 286682^2 + 199137^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121842113893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121842113993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60921056946 + 60921056947.

It is an arithmetic number, because the mean of its divisors is an integer number (60921056947).

Almost surely, 2^121842113893 is an apocalyptic number.

It is an amenable number.

121842113893 is a deficient number, since it is larger than the sum of its proper divisors (1).

121842113893 is an equidigital number, since it uses as much as digits as its factorization.

121842113893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 43.

The spelling of 121842113893 in words is "one hundred twenty-one billion, eight hundred forty-two million, one hundred thirteen thousand, eight hundred ninety-three".