121205144 has 16 divisors (see below), whose sum is σ = 230652600. Its totient is φ = 59697792.

The previous prime is 121205141. The next prime is 121205159. The reversal of 121205144 is 441502121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121205141) 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, 112529 + ... + 113600.

Almost surely, 2^121205144 is an apocalyptic number.

It is an amenable number.

121205144 is a deficient number, since it is larger than the sum of its proper divisors (109447456).

121205144 is a wasteful number, since it uses less digits than its factorization.

121205144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226202 (or 226198 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 121205144 is about 11009.3207783223. The cubic root of 121205144 is about 494.8881072125. Note that the first 3 decimals are identical.

Adding to 121205144 its reverse (441502121), we get a palindrome (562707265).

The spelling of 121205144 in words is "one hundred twenty-one million, two hundred five thousand, one hundred forty-four".