204021543213 has 6 divisors (see below), whose sum is σ = 294697784654. Its totient is φ = 136014362136.

The previous prime is 204021543203. The next prime is 204021543227. The reversal of 204021543213 is 312345120402.

204021543213 is a `hidden beast` number, since 2 + 0 + 4 + 0 + 215 + 432 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 112722690564 + 91298852649 = 335742^2 + 302157^2 .

It is not a de Polignac number, because 204021543213 - 2⁶ = 204021543149 is a prime.

It is a super-3 number, since 3×204021543213³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204021543203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11334530170 + ... + 11334530187.

Almost surely, 2^204021543213 is an apocalyptic number.

It is an amenable number.

204021543213 is a deficient number, since it is larger than the sum of its proper divisors (90676241441).

204021543213 is a wasteful number, since it uses less digits than its factorization.

204021543213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22669060363 (or 22669060360 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 204021543213 its reverse (312345120402), we get a palindrome (516366663615).

The spelling of 204021543213 in words is "two hundred four billion, twenty-one million, five hundred forty-three thousand, two hundred thirteen".