203440402100 has 72 divisors (see below), whose sum is σ = 475911206400. Its totient is φ = 75039569280.

The previous prime is 203440402097. The next prime is 203440402103. The reversal of 203440402100 is 1204044302.

It is an interprime number because it is at equal distance from previous prime (203440402097) and next prime (203440402103).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203440402103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1198301 + ... + 1357499.

Almost surely, 2^203440402100 is an apocalyptic number.

203440402100 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 203440402100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237955603200).

203440402100 is an abundant number, since it is smaller than the sum of its proper divisors (272470804300).

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

203440402100 is a wasteful number, since it uses less digits than its factorization.

203440402100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160209 (or 160202 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 203440402100 its reverse (1204044302), we get a palindrome (204644446402).

The spelling of 203440402100 in words is "two hundred three billion, four hundred forty million, four hundred two thousand, one hundred".