100120209500 has 48 divisors (see below), whose sum is σ = 218710888032. Its totient is φ = 40039228800.

The previous prime is 100120209499. The next prime is 100120209517. The reversal of 100120209500 is 5902021001.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2536919 + ... + 2576081.

It is an arithmetic number, because the mean of its divisors is an integer number (4556476834).

Almost surely, 2^100120209500 is an apocalyptic number.

100120209500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100120209500 is an abundant number, since it is smaller than the sum of its proper divisors (118590678532).

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

100120209500 is a wasteful number, since it uses less digits than its factorization.

100120209500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44295 (or 44283 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

The spelling of 100120209500 in words is "one hundred billion, one hundred twenty million, two hundred nine thousand, five hundred".