205062355021 has 4 divisors (see below), whose sum is σ = 205226537500. Its totient is φ = 204898172544.

The previous prime is 205062354977. The next prime is 205062355033. The reversal of 205062355021 is 120553260502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133433861796 + 71628493225 = 365286^2 + 267635^2 .

It is a cyclic number.

It is not a de Polignac number, because 205062355021 - 2⁹ = 205062354509 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 (205062350021) 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 3 ways as a sum of consecutive naturals, for example, 82089366 + ... + 82091863.

It is an arithmetic number, because the mean of its divisors is an integer number (51306634375).

Almost surely, 2^205062355021 is an apocalyptic number.

It is an amenable number.

205062355021 is a deficient number, since it is larger than the sum of its proper divisors (164182479).

205062355021 is a wasteful number, since it uses less digits than its factorization.

205062355021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164182478.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 205062355021 in words is "two hundred five billion, sixty-two million, three hundred fifty-five thousand, twenty-one".