2100221200120 has 64 divisors (see below), whose sum is σ = 4841187523200. Its totient is φ = 819525073920.

The previous prime is 2100221200109. The next prime is 2100221200139. The reversal of 2100221200120 is 210021220012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2100221200120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20493166 + ... + 20595394.

It is an arithmetic number, because the mean of its divisors is an integer number (75643555050).

Almost surely, 2^{2100221200120} is an apocalyptic number.

2100221200120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100221200120 is an abundant number, since it is smaller than the sum of its proper divisors (2740966323080).

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

2100221200120 is a wasteful number, since it uses less digits than its factorization.

2100221200120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114808 (or 114804 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2100221200120 its reverse (210021220012), we get a palindrome (2310242420132).

The spelling of 2100221200120 in words is "two trillion, one hundred billion, two hundred twenty-one million, two hundred thousand, one hundred twenty".