100000019900 has 36 divisors (see below), whose sum is σ = 236727322440. Its totient is φ = 36363643200.

The previous prime is 100000019893. The next prime is 100000019909. The reversal of 100000019900 is 9910000001.

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 (100000019909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45453455 + ... + 45455654.

Almost surely, 2^100000019900 is an apocalyptic number.

100000019900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100000019900 is an abundant number, since it is smaller than the sum of its proper divisors (136727302540).

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

100000019900 is a wasteful number, since it uses less digits than its factorization.

100000019900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90909134 (or 90909127 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 20.

Adding to 100000019900 its reverse (9910000001), we get a palindrome (109910019901).

The spelling of 100000019900 in words is "one hundred billion, nineteen thousand, nine hundred".