204123122140 has 24 divisors (see below), whose sum is σ = 489895493472. Its totient is φ = 69985070400.

The previous prime is 204123122129. The next prime is 204123122153. The reversal of 204123122140 is 41221321402.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 729011011 + ... + 729011290.

It is an arithmetic number, because the mean of its divisors is an integer number (20412312228).

Almost surely, 2^204123122140 is an apocalyptic number.

204123122140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204123122140 is an abundant number, since it is smaller than the sum of its proper divisors (285772371332).

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

204123122140 is a wasteful number, since it uses less digits than its factorization.

204123122140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458022317 (or 1458022315 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 204123122140 its reverse (41221321402), we get a palindrome (245344443542).

The spelling of 204123122140 in words is "two hundred four billion, one hundred twenty-three million, one hundred twenty-two thousand, one hundred forty".