204243155101 has 4 divisors (see below), whose sum is σ = 209763240412. Its totient is φ = 198723069792.

The previous prime is 204243155099. The next prime is 204243155107. The reversal of 204243155101 is 101551342402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101551342402 = 2 ⋅50775671201.

It can be written as a sum of positive squares in 2 ways, for example, as 85407140025 + 118836015076 = 292245^2 + 344726^2 .

It is a cyclic number.

It is not a de Polignac number, because 204243155101 - 2¹ = 204243155099 is a prime.

It is a super-2 number, since 2×204243155101² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204243155101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204243155107) 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, 2760042600 + ... + 2760042673.

It is an arithmetic number, because the mean of its divisors is an integer number (52440810103).

Almost surely, 2^204243155101 is an apocalyptic number.

It is an amenable number.

204243155101 is a deficient number, since it is larger than the sum of its proper divisors (5520085311).

204243155101 is an equidigital number, since it uses as much as digits as its factorization.

204243155101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5520085310.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 204243155101 its reverse (101551342402), we get a palindrome (305794497503).

The spelling of 204243155101 in words is "two hundred four billion, two hundred forty-three million, one hundred fifty-five thousand, one hundred one".