2100111221020 has 12 divisors (see below), whose sum is σ = 4410233564184. Its totient is φ = 840044488400.

The previous prime is 2100111221017. The next prime is 2100111221027. The reversal of 2100111221020 is 201221110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100111221027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52502780506 + ... + 52502780545.

It is an arithmetic number, because the mean of its divisors is an integer number (367519463682).

Almost surely, 2^{2100111221020} is an apocalyptic number.

2100111221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100111221020 is an abundant number, since it is smaller than the sum of its proper divisors (2310122343164).

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

2100111221020 is a wasteful number, since it uses less digits than its factorization.

2100111221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105005561060 (or 105005561058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2100111221020 its reverse (201221110012), we get a palindrome (2301332331032).

The spelling of 2100111221020 in words is "two trillion, one hundred billion, one hundred eleven million, two hundred twenty-one thousand, twenty".