2100001111200 has 216 divisors, whose sum is σ = 7450563320928. Its totient is φ = 556564400640.

The previous prime is 2100001111099. The next prime is 2100001111211. The reversal of 2100001111200 is 21111000012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 278917 + ... + 2068283.

It is an arithmetic number, because the mean of its divisors is an integer number (34493348708).

Almost surely, 2^{2100001111200} is an apocalyptic number.

2100001111200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2100001111200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3725281660464).

2100001111200 is an abundant number, since it is smaller than the sum of its proper divisors (5350562209728).

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

2100001111200 is a wasteful number, since it uses less digits than its factorization.

2100001111200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789556 (or 1789540 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 2100001111200 its reverse (21111000012), we get a palindrome (2121112111212).

The spelling of 2100001111200 in words is "two trillion, one hundred billion, one million, one hundred eleven thousand, two hundred".