2001111212100 has 1152 divisors, whose sum is σ = 8214674227200. Its totient is φ = 362634854400.

The previous prime is 2001111212077. The next prime is 2001111212171. The reversal of 2001111212100 is 12121111002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 409306456 + ... + 409311344.

It is an arithmetic number, because the mean of its divisors is an integer number (7130793600).

Almost surely, 2^{2001111212100} is an apocalyptic number.

2001111212100 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 2001111212100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4107337113600).

2001111212100 is an abundant number, since it is smaller than the sum of its proper divisors (6213563015100).

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

2001111212100 is a wasteful number, since it uses less digits than its factorization.

2001111212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5013 (or 5006 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 2001111212100 its reverse (12121111002), we get a palindrome (2013232323102).

The spelling of 2001111212100 in words is "two trillion, one billion, one hundred eleven million, two hundred twelve thousand, one hundred".