2100191000 has 32 divisors (see below), whose sum is σ = 4914449280. Its totient is φ = 840076000.

The previous prime is 2100190951. The next prime is 2100191039. The reversal of 2100191000 is 1910012.

It is a congruent number.

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, 1049096 + ... + 1051095.

It is an arithmetic number, because the mean of its divisors is an integer number (153576540).

Almost surely, 2^2100191000 is an apocalyptic number.

2100191000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100191000 is an abundant number, since it is smaller than the sum of its proper divisors (2814258280).

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

2100191000 is a wasteful number, since it uses less digits than its factorization.

2100191000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100212 (or 2100198 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 2100191000 is about 45827.8408830266. The cubic root of 2100191000 is about 1280.6179877185.

The spelling of 2100191000 in words is "two billion, one hundred million, one hundred ninety-one thousand".