2001100201 has 4 divisors (see below), whose sum is σ = 2001190032. Its totient is φ = 2001010372.

The previous prime is 2001100187. The next prime is 2001100207. The reversal of 2001100201 is 1020011002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1020011002 = 2 ⋅510005501.

It is a cyclic number.

It is not a de Polignac number, because 2001100201 - 2⁹ = 2001099689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001100207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16410 + ... + 65356.

It is an arithmetic number, because the mean of its divisors is an integer number (500297508).

Almost surely, 2^2001100201 is an apocalyptic number.

It is an amenable number.

2001100201 is a deficient number, since it is larger than the sum of its proper divisors (89831).

2001100201 is an equidigital number, since it uses as much as digits as its factorization.

2001100201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89830.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 2001100201 is about 44733.6584799410. The cubic root of 2001100201 is about 1260.1520352782.

Adding to 2001100201 its reverse (1020011002), we get a palindrome (3021111203).

It can be divided in two parts, 200 and 1100201, that added together give a square (1100401 = 1049²).

The spelling of 2001100201 in words is "two billion, one million, one hundred thousand, two hundred one".