204221215017 has 12 divisors (see below), whose sum is σ = 295029308340. Its totient is φ = 136127580288.

The previous prime is 204221215007. The next prime is 204221215021. The reversal of 204221215017 is 710512122402.

It is a happy number.

204221215017 is a `hidden beast` number, since 20 + 422 + 1 + 215 + 0 + 1 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 22161979161 + 182059235856 = 148869^2 + 426684^2 .

It is not a de Polignac number, because 204221215017 - 2¹⁴ = 204221198633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204221215007) 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 11 ways as a sum of consecutive naturals, for example, 1592892 + ... + 1716317.

It is an arithmetic number, because the mean of its divisors is an integer number (24585775695).

Almost surely, 2^204221215017 is an apocalyptic number.

It is an amenable number.

204221215017 is a deficient number, since it is larger than the sum of its proper divisors (90808093323).

204221215017 is a wasteful number, since it uses less digits than its factorization.

204221215017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3316072 (or 3316069 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

Adding to 204221215017 its reverse (710512122402), we get a palindrome (914733337419).

The spelling of 204221215017 in words is "two hundred four billion, two hundred twenty-one million, two hundred fifteen thousand, seventeen".