204243121040 has 120 divisors (see below), whose sum is σ = 564147856512. Its totient is φ = 68536231680.

The previous prime is 204243121021. The next prime is 204243121111. The reversal of 204243121040 is 40121342402.

It is a junction number, because it is equal to n+sod(n) for n = 204243120997 and 204243121015.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 370046 + ... + 738525.

Almost surely, 2^204243121040 is an apocalyptic number.

204243121040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204243121040 is an abundant number, since it is smaller than the sum of its proper divisors (359904735472).

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

204243121040 is a wasteful number, since it uses less digits than its factorization.

204243121040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108645 (or 1108632 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 204243121040 its reverse (40121342402), we get a palindrome (244364463442).

The spelling of 204243121040 in words is "two hundred four billion, two hundred forty-three million, one hundred twenty-one thousand, forty".