100919191820 has 24 divisors (see below), whose sum is σ = 212009229600. Its totient is φ = 40352643072.

The previous prime is 100919191801. The next prime is 100919191853. The reversal of 100919191820 is 28191919001.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 884480 + ... + 992039.

It is an arithmetic number, because the mean of its divisors is an integer number (8833717900).

Almost surely, 2^100919191820 is an apocalyptic number.

100919191820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100919191820 is an abundant number, since it is smaller than the sum of its proper divisors (111090037780).

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

100919191820 is a wasteful number, since it uses less digits than its factorization.

100919191820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879217 (or 1879215 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 41.

It can be divided in two parts, 1009191 and 91820, that added together give a palindrome (1101011).

The spelling of 100919191820 in words is "one hundred billion, nine hundred nineteen million, one hundred ninety-one thousand, eight hundred twenty".