205204421051 has 16 divisors (see below), whose sum is σ = 246227216640. Its totient is φ = 167289645600.

The previous prime is 205204421033. The next prime is 205204421057. The reversal of 205204421051 is 150124402502.

It is not a de Polignac number, because 205204421051 - 2⁶ = 205204420987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205204421051.

It is not an unprimeable number, because it can be changed into a prime (205204421057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7530125 + ... + 7557326.

It is an arithmetic number, because the mean of its divisors is an integer number (15389201040).

Almost surely, 2^205204421051 is an apocalyptic number.

205204421051 is a deficient number, since it is larger than the sum of its proper divisors (41022795589).

205204421051 is a wasteful number, since it uses less digits than its factorization.

205204421051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15087554.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 205204421051 its reverse (150124402502), we get a palindrome (355328823553).

The spelling of 205204421051 in words is "two hundred five billion, two hundred four million, four hundred twenty-one thousand, fifty-one".