203012321100 has 72 divisors (see below), whose sum is σ = 595428713040. Its totient is φ = 53395015680.

The previous prime is 203012321041. The next prime is 203012321117. The reversal of 203012321100 is 1123210302.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 203012321100.

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, 4613085 + ... + 4656884.

Almost surely, 2^203012321100 is an apocalyptic number.

203012321100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

203012321100 is an abundant number, since it is smaller than the sum of its proper divisors (392416391940).

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

203012321100 is a wasteful number, since it uses less digits than its factorization.

203012321100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9270059 (or 9270052 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 203012321100 its reverse (1123210302), we get a palindrome (204135531402).

It can be divided in two parts, 2030 and 12321100, that added together give a triangular number (12323130 = T₄₉₆₄).

The spelling of 203012321100 in words is "two hundred three billion, twelve million, three hundred twenty-one thousand, one hundred".