205042104242 has 4 divisors (see below), whose sum is σ = 307563156366. Its totient is φ = 102521052120.

The previous prime is 205042104227. The next prime is 205042104259. The reversal of 205042104242 is 242401240502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 171728188801 + 33313915441 = 414401^2 + 182521^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51260526059 + ... + 51260526062.

Almost surely, 2^205042104242 is an apocalyptic number.

205042104242 is a deficient number, since it is larger than the sum of its proper divisors (102521052124).

205042104242 is a wasteful number, since it uses less digits than its factorization.

205042104242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102521052123.

The product of its (nonzero) digits is 5120, while the sum is 26.

Adding to 205042104242 its reverse (242401240502), we get a palindrome (447443344744).

The spelling of 205042104242 in words is "two hundred five billion, forty-two million, one hundred four thousand, two hundred forty-two".