203108921904 has 160 divisors (see below), whose sum is σ = 615351614976. Its totient is φ = 56517027840.

The previous prime is 203108921891. The next prime is 203108921909. The reversal of 203108921904 is 409129801302.

It is not an unprimeable number, because it can be changed into a prime (203108921909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8073954 + ... + 8099070.

Almost surely, 2^203108921904 is an apocalyptic number.

203108921904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 203108921904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307675807488).

203108921904 is an abundant number, since it is smaller than the sum of its proper divisors (412242693072).

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

203108921904 is a wasteful number, since it uses less digits than its factorization.

203108921904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25763 (or 25757 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The spelling of 203108921904 in words is "two hundred three billion, one hundred eight million, nine hundred twenty-one thousand, nine hundred four".