2100111012220 has 72 divisors (see below), whose sum is σ = 4807629892800. Its totient is φ = 770221221120.

The previous prime is 2100111012217. The next prime is 2100111012229. The reversal of 2100111012220 is 222101110012.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 2100111012220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100111012229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1581396 + ... + 2588635.

It is an arithmetic number, because the mean of its divisors is an integer number (66772637400).

Almost surely, 2^{2100111012220} is an apocalyptic number.

2100111012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100111012220 is an abundant number, since it is smaller than the sum of its proper divisors (2707518880580).

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

2100111012220 is a wasteful number, since it uses less digits than its factorization.

2100111012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4170215 (or 4170200 counting only the distinct ones).

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

Adding to 2100111012220 its reverse (222101110012), we get a palindrome (2322212122232).

The spelling of 2100111012220 in words is "two trillion, one hundred billion, one hundred eleven million, twelve thousand, two hundred twenty".