204121313123 has 32 divisors (see below), whose sum is σ = 263237517312. Its totient is φ = 153839347200.

The previous prime is 204121313119. The next prime is 204121313167. The reversal of 204121313123 is 321313121402.

204121313123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 204121313123 - 2² = 204121313119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (204121313423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 302078 + ... + 706748.

It is an arithmetic number, because the mean of its divisors is an integer number (8226172416).

Almost surely, 2^204121313123 is an apocalyptic number.

204121313123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

204121313123 is a deficient number, since it is larger than the sum of its proper divisors (59116204189).

204121313123 is a wasteful number, since it uses less digits than its factorization.

204121313123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404955.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 204121313123 its reverse (321313121402), we get a palindrome (525434434525).

The spelling of 204121313123 in words is "two hundred four billion, one hundred twenty-one million, three hundred thirteen thousand, one hundred twenty-three".