2011122012100 has 72 divisors (see below), whose sum is σ = 4522532414400. Its totient is φ = 775348291200.

The previous prime is 2011122012077. The next prime is 2011122012173. The reversal of 2011122012100 is 12102211102.

It is a super-2 number, since 2×2011122012100² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1048641 + ... + 2263159.

It is an arithmetic number, because the mean of its divisors is an integer number (62812950200).

Almost surely, 2^{2011122012100} is an apocalyptic number.

2011122012100 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 2011122012100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2261266207200).

2011122012100 is an abundant number, since it is smaller than the sum of its proper divisors (2511410402300).

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

2011122012100 is a wasteful number, since it uses less digits than its factorization.

2011122012100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215133 (or 1215126 counting only the distinct ones).

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

Adding to 2011122012100 its reverse (12102211102), we get a palindrome (2023224223202).

The spelling of 2011122012100 in words is "two trillion, eleven billion, one hundred twenty-two million, twelve thousand, one hundred".