204521345021064 has 64 divisors (see below), whose sum is σ = 512716309156800. Its totient is φ = 67985644605696.

The previous prime is 204521345021027. The next prime is 204521345021069. The reversal of 204521345021064 is 460120543125402.

It is not an unprimeable number, because it can be changed into a prime (204521345021069) 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, 4799722 + ... + 20786534.

It is an arithmetic number, because the mean of its divisors is an integer number (8011192330575).

Almost surely, 2^{204521345021064} is an apocalyptic number.

204521345021064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

204521345021064 is an abundant number, since it is smaller than the sum of its proper divisors (308194964135736).

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

204521345021064 is a wasteful number, since it uses less digits than its factorization.

204521345021064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15988294 (or 15988290 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 39.

Adding to 204521345021064 its reverse (460120543125402), we get a palindrome (664641888146466).

The spelling of 204521345021064 in words is "two hundred four trillion, five hundred twenty-one billion, three hundred forty-five million, twenty-one thousand, sixty-four".