2112100100 has 72 divisors (see below), whose sum is σ = 5106423168. Its totient is φ = 751676800.

The previous prime is 2112100099. The next prime is 2112100103. The reversal of 2112100100 is 10012112.

It is not an unprimeable number, because it can be changed into a prime (2112100103) 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, 31274 + ... + 72126.

It is an arithmetic number, because the mean of its divisors is an integer number (70922544).

Almost surely, 2^2112100100 is an apocalyptic number.

2112100100 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 2112100100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2553211584).

2112100100 is an abundant number, since it is smaller than the sum of its proper divisors (2994323068).

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

2112100100 is a wasteful number, since it uses less digits than its factorization.

2112100100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40925 (or 40918 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 2112100100 is about 45957.5902327352. The cubic root of 2112100100 is about 1283.0340015131.

Adding to 2112100100 its reverse (10012112), we get a palindrome (2122112212).

It can be divided in two parts, 21 and 12100100, that added together give a palindrome (12100121).

The spelling of 2112100100 in words is "two billion, one hundred twelve million, one hundred thousand, one hundred".