205057021070 has 64 divisors (see below), whose sum is σ = 433569542400. Its totient is φ = 68990415360.

The previous prime is 205057021007. The next prime is 205057021073. The reversal of 205057021070 is 70120750502.

It is a Curzon 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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 818960 + ... + 1039619.

It is an arithmetic number, because the mean of its divisors is an integer number (6774524100).

Almost surely, 2^205057021070 is an apocalyptic number.

205057021070 is an abundant number, since it is smaller than the sum of its proper divisors (228512521330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205057021070 is a wasteful number, since it uses less digits than its factorization.

205057021070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1858673.

The product of its (nonzero) digits is 4900, while the sum is 29.

Adding to 205057021070 its reverse (70120750502), we get a palindrome (275177771572).

The spelling of 205057021070 in words is "two hundred five billion, fifty-seven million, twenty-one thousand, seventy".