205111311242 has 16 divisors (see below), whose sum is σ = 314882346240. Its totient is φ = 100151443392.

The previous prime is 205111311221. The next prime is 205111311247. The reversal of 205111311242 is 242113111502.

It is not an unprimeable number, because it can be changed into a prime (205111311247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228098 + ... + 679890.

It is an arithmetic number, because the mean of its divisors is an integer number (19680146640).

Almost surely, 2^205111311242 is an apocalyptic number.

205111311242 is a deficient number, since it is larger than the sum of its proper divisors (109771034998).

205111311242 is a wasteful number, since it uses less digits than its factorization.

205111311242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457117.

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 205111311242 its reverse (242113111502), we get a palindrome (447224422744).

The spelling of 205111311242 in words is "two hundred five billion, one hundred eleven million, three hundred eleven thousand, two hundred forty-two".