204121312040 has 32 divisors (see below), whose sum is σ = 459354278880. Its totient is φ = 81634066752.

The previous prime is 204121312039. The next prime is 204121312193. The reversal of 204121312040 is 40213121402.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221654 + ... + 676293.

It is an arithmetic number, because the mean of its divisors is an integer number (14354821215).

Almost surely, 2^204121312040 is an apocalyptic number.

204121312040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204121312040 is an abundant number, since it is smaller than the sum of its proper divisors (255232966840).

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

204121312040 is a wasteful number, since it uses less digits than its factorization.

204121312040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903641 (or 903637 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 204121312040 its reverse (40213121402), we get a palindrome (244334433442).

The spelling of 204121312040 in words is "two hundred four billion, one hundred twenty-one million, three hundred twelve thousand, forty".