2001121021100 has 36 divisors (see below), whose sum is σ = 4364932308744. Its totient is φ = 796300999680.

The previous prime is 2001121021087. The next prime is 2001121021127. The reversal of 2001121021100 is 11201211002.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51823214 + ... + 51861813.

Almost surely, 2^{2001121021100} is an apocalyptic number.

2001121021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001121021100 is an abundant number, since it is smaller than the sum of its proper divisors (2363811287644).

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

2001121021100 is a wasteful number, since it uses less digits than its factorization.

2001121021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103685234 (or 103685227 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2001121021100 its reverse (11201211002), we get a palindrome (2012322232102).

The spelling of 2001121021100 in words is "two trillion, one billion, one hundred twenty-one million, twenty-one thousand, one hundred".