205561200121043 has 32 divisors (see below), whose sum is σ = 226773196776000. Its totient is φ = 185159851868160.

The previous prime is 205561200121031. The next prime is 205561200121061. The reversal of 205561200121043 is 340121002165502.

205561200121043 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 205561200121043 - 2¹² = 205561200116947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205561200121073) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 563773208 + ... + 564137706.

It is an arithmetic number, because the mean of its divisors is an integer number (7086662399250).

Almost surely, 2^{205561200121043} is an apocalyptic number.

205561200121043 is a deficient number, since it is larger than the sum of its proper divisors (21211996654957).

205561200121043 is a wasteful number, since it uses less digits than its factorization.

205561200121043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368999.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 205561200121043 its reverse (340121002165502), we get a palindrome (545682202286545).

The spelling of 205561200121043 in words is "two hundred five trillion, five hundred sixty-one billion, two hundred million, one hundred twenty-one thousand, forty-three".