121205121 has 8 divisors (see below), whose sum is σ = 171113184. Its totient is φ = 76050240.

The previous prime is 121205111. The next prime is 121205141. The reversal of 121205121 is 121502121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121205121 - 2¹⁴ = 121188737 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121205121.

It is not an unprimeable number, because it can be changed into a prime (121205111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1188235 + ... + 1188336.

It is an arithmetic number, because the mean of its divisors is an integer number (21389148).

Almost surely, 2^121205121 is an apocalyptic number.

It is an amenable number.

121205121 is a deficient number, since it is larger than the sum of its proper divisors (49908063).

121205121 is a wasteful number, since it uses less digits than its factorization.

121205121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376591.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 121205121 is about 11009.3197337529. The cubic root of 121205121 is about 494.8880759090. Note that the first 3 decimals are identical.

Adding to 121205121 its reverse (121502121), we get a palindrome (242707242).

The spelling of 121205121 in words is "one hundred twenty-one million, two hundred five thousand, one hundred twenty-one".