2001221110100 has 36 divisors (see below), whose sum is σ = 4342952387424. Its totient is φ = 800432669280.

The previous prime is 2001221110087. The next prime is 2001221110159. The reversal of 2001221110100 is 10111221002.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 760367 + ... + 2140233.

Almost surely, 2^{2001221110100} is an apocalyptic number.

2001221110100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001221110100 is an abundant number, since it is smaller than the sum of its proper divisors (2341731277324).

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

2001221110100 is a wasteful number, since it uses less digits than its factorization.

2001221110100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394384 (or 1394377 counting only the distinct ones).

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

Adding to 2001221110100 its reverse (10111221002), we get a palindrome (2011332331102).

The spelling of 2001221110100 in words is "two trillion, one billion, two hundred twenty-one million, one hundred ten thousand, one hundred".