205057021071 has 16 divisors (see below), whose sum is σ = 313292307200. Its totient is φ = 116866266048.

The previous prime is 205057021007. The next prime is 205057021073. The reversal of 205057021071 is 170120750502.

It is not a de Polignac number, because 205057021071 - 2⁶ = 205057021007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205057021073) 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, 12874126 + ... + 12890043.

It is an arithmetic number, because the mean of its divisors is an integer number (19580769200).

Almost surely, 2^205057021071 is an apocalyptic number.

205057021071 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

205057021071 is a deficient number, since it is larger than the sum of its proper divisors (108235286129).

205057021071 is a wasteful number, since it uses less digits than its factorization.

205057021071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25764558.

The product of its (nonzero) digits is 4900, while the sum is 30.

Adding to 205057021071 its reverse (170120750502), we get a palindrome (375177771573).

The spelling of 205057021071 in words is "two hundred five billion, fifty-seven million, twenty-one thousand, seventy-one".