2001212100100 has 18 divisors (see below), whose sum is σ = 4342630257434. Its totient is φ = 800484840000.

The previous prime is 2001212100073. The next prime is 2001212100101. The reversal of 2001212100100 is 10012121002.

It can be written as a sum of positive squares in 3 ways, for example, as 17165192256 + 1984046907844 = 131016^2 + 1408562^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (2001212100101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10006060401 + ... + 10006060600.

Almost surely, 2^{2001212100100} is an apocalyptic number.

2001212100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001212100100 is an abundant number, since it is smaller than the sum of its proper divisors (2341418157334).

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

2001212100100 is a wasteful number, since it uses less digits than its factorization.

2001212100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20012121015 (or 20012121008 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2001212100100 its reverse (10012121002), we get a palindrome (2011224221102).

The spelling of 2001212100100 in words is "two trillion, one billion, two hundred twelve million, one hundred thousand, one hundred".