205443421300 has 72 divisors (see below), whose sum is σ = 493081411256. Its totient is φ = 73805852160.

The previous prime is 205443421241. The next prime is 205443421319. The reversal of 205443421300 is 3124344502.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 25562253924 + 179881167376 = 159882^2 + 424124^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2087487 + ... + 2183686.

Almost surely, 2^205443421300 is an apocalyptic number.

205443421300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205443421300 is an abundant number, since it is smaller than the sum of its proper divisors (287637989956).

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

205443421300 is a wasteful number, since it uses less digits than its factorization.

205443421300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4271237 (or 4271230 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 205443421300 its reverse (3124344502), we get a palindrome (208567765802).

The spelling of 205443421300 in words is "two hundred five billion, four hundred forty-three million, four hundred twenty-one thousand, three hundred".