2001121100 has 72 divisors (see below), whose sum is σ = 4847481408. Its totient is φ = 710740800.

The previous prime is 2001121099. The next prime is 2001121117. The reversal of 2001121100 is 11211002.

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, 26147 + ... + 68453.

Almost surely, 2^2001121100 is an apocalyptic number.

2001121100 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 2001121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2423740704).

2001121100 is an abundant number, since it is smaller than the sum of its proper divisors (2846360308).

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

2001121100 is a wasteful number, since it uses less digits than its factorization.

2001121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42375 (or 42368 counting only the distinct ones).

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

The square root of 2001121100 is about 44733.8920730133. The cubic root of 2001121100 is about 1260.1564221692.

Adding to 2001121100 its reverse (11211002), we get a palindrome (2012332102).

The spelling of 2001121100 in words is "two billion, one million, one hundred twenty-one thousand, one hundred".