204121013101 has 4 divisors (see below), whose sum is σ = 204244201852. Its totient is φ = 203997824352.

The previous prime is 204121013099. The next prime is 204121013153. The reversal of 204121013101 is 101310121402.

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 82211799076 + 121909214025 = 286726^2 + 349155^2 .

It is a cyclic number.

It is not a de Polignac number, because 204121013101 - 2¹ = 204121013099 is a prime.

It is a super-2 number, since 2×204121013101² (a number of 23 digits) contains 22 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 (204121013401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61591890 + ... + 61595203.

It is an arithmetic number, because the mean of its divisors is an integer number (51061050463).

Almost surely, 2^204121013101 is an apocalyptic number.

It is an amenable number.

204121013101 is a deficient number, since it is larger than the sum of its proper divisors (123188751).

204121013101 is a wasteful number, since it uses less digits than its factorization.

204121013101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123188750.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 204121013101 its reverse (101310121402), we get a palindrome (305431134503).

The spelling of 204121013101 in words is "two hundred four billion, one hundred twenty-one million, thirteen thousand, one hundred one".