121330205 has 4 divisors (see below), whose sum is σ = 145596252. Its totient is φ = 97064160.

The previous prime is 121330201. The next prime is 121330211. The reversal of 121330205 is 502033121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 502033121 = 23 ⋅21827527.

It can be written as a sum of positive squares in 2 ways, for example, as 49182169 + 72148036 = 7013^2 + 8494^2 .

It is not a de Polignac number, because 121330205 - 2² = 121330201 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121330201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12133016 + ... + 12133025.

It is an arithmetic number, because the mean of its divisors is an integer number (36399063).

Almost surely, 2^121330205 is an apocalyptic number.

It is an amenable number.

121330205 is a deficient number, since it is larger than the sum of its proper divisors (24266047).

121330205 is an equidigital number, since it uses as much as digits as its factorization.

121330205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24266046.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 121330205 is about 11014.9990921470. Note that the first 3 decimals coincide. The cubic root of 121330205 is about 495.0582593062.

Adding to 121330205 its reverse (502033121), we get a palindrome (623363326).

The spelling of 121330205 in words is "one hundred twenty-one million, three hundred thirty thousand, two hundred five".