121864121 has 2 divisors, whose sum is σ = 121864122. Its totient is φ = 121864120.

The previous prime is 121864073. The next prime is 121864123. The reversal of 121864121 is 121468121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117072400 + 4791721 = 10820^2 + 2189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121864121 is a prime.

Together with 121864123, 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 (121864123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60932060 + 60932061.

It is an arithmetic number, because the mean of its divisors is an integer number (60932061).

Almost surely, 2^121864121 is an apocalyptic number.

It is an amenable number.

121864121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121864121 is an equidigital number, since it uses as much as digits as its factorization.

121864121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 26.

The square root of 121864121 is about 11039.2083502396. The cubic root of 121864121 is about 495.7833679912.

The spelling of 121864121 in words is "one hundred twenty-one million, eight hundred sixty-four thousand, one hundred twenty-one".