121510121 has 2 divisors, whose sum is σ = 121510122. Its totient is φ = 121510120.

The previous prime is 121510117. The next prime is 121510133. The reversal of 121510121 is 121015121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116402521 + 5107600 = 10789^2 + 2260^2 .

It is a cyclic number.

It is not a de Polignac number, because 121510121 - 2² = 121510117 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121510096 and 121510105.

It is not a weakly prime, because it can be changed into another prime (121510141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60755060 + 60755061.

It is an arithmetic number, because the mean of its divisors is an integer number (60755061).

Almost surely, 2^121510121 is an apocalyptic number.

It is an amenable number.

121510121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121510121 is an equidigital number, since it uses as much as digits as its factorization.

121510121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20, while the sum is 14.

The square root of 121510121 is about 11023.1629308470. The cubic root of 121510121 is about 495.3028395473.

Adding to 121510121 its reverse (121015121), we get a palindrome (242525242).

The spelling of 121510121 in words is "one hundred twenty-one million, five hundred ten thousand, one hundred twenty-one".