2101911020 has 24 divisors (see below), whose sum is σ = 4815287568. Its totient is φ = 764331200.

The previous prime is 2101911013. The next prime is 2101911029. The reversal of 2101911020 is 201191012.

It is a self number, because there is not a number n which added to its sum of digits gives 2101911020.

It is not an unprimeable number, because it can be changed into a prime (2101911029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4776851 + ... + 4777290.

It is an arithmetic number, because the mean of its divisors is an integer number (200636982).

Almost surely, 2^2101911020 is an apocalyptic number.

2101911020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101911020 is an abundant number, since it is smaller than the sum of its proper divisors (2713376548).

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

2101911020 is a wasteful number, since it uses less digits than its factorization.

2101911020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9554161 (or 9554159 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 2101911020 is about 45846.6031457075. The cubic root of 2101911020 is about 1280.9674936291.

The spelling of 2101911020 in words is "two billion, one hundred one million, nine hundred eleven thousand, twenty".