2001201100100 has 144 divisors (see below), whose sum is σ = 4450631297616. Its totient is φ = 780853248000.

The previous prime is 2001201100097. The next prime is 2001201100121. The reversal of 2001201100100 is 10011021002.

It can be written as a sum of positive squares in 24 ways, for example, as 1551359927296 + 449841172804 = 1245536^2 + 670702^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 281024540 + ... + 281031660.

It is an arithmetic number, because the mean of its divisors is an integer number (30907161789).

Almost surely, 2^{2001201100100} is an apocalyptic number.

2001201100100 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 2001201100100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2225315648808).

2001201100100 is an abundant number, since it is smaller than the sum of its proper divisors (2449430197516).

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

2001201100100 is a wasteful number, since it uses less digits than its factorization.

2001201100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7626 (or 7619 counting only the distinct ones).

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

Adding to 2001201100100 its reverse (10011021002), we get a palindrome (2011212121102).

The spelling of 2001201100100 in words is "two trillion, one billion, two hundred one million, one hundred thousand, one hundred".