205122121234 has 8 divisors (see below), whose sum is σ = 308508070860. Its totient is φ = 102286097616.

The previous prime is 205122121229. The next prime is 205122121249. The reversal of 205122121234 is 432121221502.

205122121234 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 204940006209 + 182115025 = 452703^2 + 13495^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 205122121199 and 205122121208.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137480569 + ... + 137482060.

Almost surely, 2^205122121234 is an apocalyptic number.

205122121234 is a deficient number, since it is larger than the sum of its proper divisors (103385949626).

205122121234 is a wasteful number, since it uses less digits than its factorization.

205122121234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274963004.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 205122121234 its reverse (432121221502), we get a palindrome (637243342736).

The spelling of 205122121234 in words is "two hundred five billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred thirty-four".