203000021100 has 180 divisors, whose sum is σ = 658326847024. Its totient is φ = 54110229120.

The previous prime is 203000021093. The next prime is 203000021143. The reversal of 203000021100 is 1120000302.

It is a happy number.

203000021100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

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 59 ways as a sum of consecutive naturals, for example, 28046682 + ... + 28053918.

Almost surely, 2^203000021100 is an apocalyptic number.

203000021100 is a gapful number since it is divisible by the number (20) 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 203000021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329163423512).

203000021100 is an abundant number, since it is smaller than the sum of its proper divisors (455326825924).

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

203000021100 is a wasteful number, since it uses less digits than its factorization.

203000021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10726 (or 10710 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 203000021100 its reverse (1120000302), we get a palindrome (204120021402).

The spelling of 203000021100 in words is "two hundred three billion, twenty-one thousand, one hundred".